diff --git a/README.md b/README.md
index 10c604d..595f5ad 100644
--- a/README.md
+++ b/README.md
@@ -239,7 +239,7 @@ jobs:
 | source_repo_ssh_private_key | `[optional]` private ssh key for the source repository. [see](#private-template-repository)                   | `false`  |                                                                       |
 | pr_branch_name_prefix       | `[optional]` the prefix of branches created by this action                                                    | `false`  | `chore/template_sync`                                                 |
 | pr_title                    | `[optional]` the title of PRs opened by this action. Must be already created.                                 | `false`  | `upstream merge template repository`                                  |
-| pr_body                     | `[optional]` the body of PRs opened by this action. | `false` | `Merge ${SOURCE_REPO_PATH} ${TEMPLATE_GIT_HASH}` |
+| pr_body                     | `[optional]` the body of PRs opened by this action. | `false` | `Merge ${SOURCE_REPO} ${TEMPLATE_GIT_HASH}` |
 | pr_labels                   | `[optional]` comma separated list. [pull request labels][pr-labels].                                          | `false`  | `sync_template`                                                       |
 | pr_reviewers                | `[optional]` comma separated list of pull request reviewers.                                                  | `false`  |                                                                       |
 | pr_commit_msg               | `[optional]` commit message in the created pull request                                                       | `false`  | `chore(template): merge template changes :up:`                        |
@@ -265,6 +265,7 @@ jobs:
 | output | description |
 | ------ | ----------- |
 | pr_branch | The name of the branch used for the pull request |
+| template_git_hash | The template source repository git hash |
 
 **Remarks** Please consider following edge cases
 
@@ -394,15 +395,14 @@ or you set the hooks input parameter within the action definition with a related
 
 The following hooks are supported (please check [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md) for a better understanding of the lifecycles).
 
-* `install` is executed after the container has started and after reading and setting up the environment.
 * `prepull` is executed before the code is pulled from the source repository
 * `precommit` is executed before the code is commited
 * `prepush` is executed before the push is executed, right after the commit
 * `precleanup` is executed before older PRs targeting the same branch are closed
 * `prepr` is executed before the PR is done
 
-**Remark** The underlying OS is defined by an Alpine container.
-E.q. for the installation phase you need to use commands like `apk add --update --no-cache python3`
+**Remark** If you need to install aditional tools just install them in an additional step upfront the action invokation.
+If using the docker image the underlying OS is defined by an Alpine container.
 
 ### Example for the hooks input parameter
 
@@ -441,10 +441,6 @@ Please not the double quotes within the following `prepull echo` command
 
 ```yml
 hooks:
-  install:
-    commands:
-      - apk add --update --no-cache python3
-      - python3 --version
   prepull:
     commands:
       - echo "hi, we are within the prepull phase ${MY_VAR}"
diff --git a/action.yml b/action.yml
index b781053..732db6a 100644
--- a/action.yml
+++ b/action.yml
@@ -71,6 +71,9 @@ outputs:
   pr_branch:
     description: "The name of the PR branch"
     value: ${{ steps.sync.outputs.pr_branch }}
+  template_git_hash:
+    description: "The git hash of the template source repository"
+    value: ${{ steps.sync.outputs.template_git_hash }}
 runs:
   using: "composite"
   # image: "src/Dockerfile"
diff --git a/src/sync_template.sh b/src/sync_template.sh
index 3b2036a..df0dfda 100755
--- a/src/sync_template.sh
+++ b/src/sync_template.sh
@@ -45,14 +45,30 @@ fi
 IS_FORCE_PUSH_PR="${IS_FORCE_PUSH_PR:-"false"}"
 GIT_REMOTE_PULL_PARAMS="${GIT_REMOTE_PULL_PARAMS:---allow-unrelated-histories --squash --strategy=recursive -X theirs}"
 
-cmd_from_yml "install"
-
 TEMPLATE_SYNC_IGNORE_FILE_PATH=".templatesyncignore"
 TEMPLATE_REMOTE_GIT_HASH=$(git ls-remote "${SOURCE_REPO}" HEAD | awk '{print $1}')
-NEW_TEMPLATE_GIT_HASH=$(git rev-parse --short "${TEMPLATE_REMOTE_GIT_HASH}")
-NEW_BRANCH="${PR_BRANCH_NAME_PREFIX}_${NEW_TEMPLATE_GIT_HASH}"
-PR_BODY="${PR_BODY:-Merge ${SOURCE_REPO_PATH} ${NEW_TEMPLATE_GIT_HASH}}"
-debug "new Git HASH ${NEW_TEMPLATE_GIT_HASH}"
+SHORT_TEMPLATE_GIT_HASH=$(git rev-parse --short "${TEMPLATE_REMOTE_GIT_HASH}")
+
+export TEMPLATE_GIT_HASH=${SHORT_TEMPLATE_GIT_HASH}
+export PR_BRANCH="${PR_BRANCH_NAME_PREFIX}_${TEMPLATE_GIT_HASH}"
+: "${PR_BODY:="Merge ${SOURCE_REPO} ${TEMPLATE_GIT_HASH}"}"
+: "${PR_TITLE:-"upstream merge template repository"}"
+
+# for some reasons the substitution is not working as expected
+# so we substitute manually
+# shellcheck disable=SC2016
+PR_BODY=${PR_BODY//'${TEMPLATE_GIT_HASH}'/"${TEMPLATE_GIT_HASH}"}
+# shellcheck disable=SC2016
+PR_BODY=${PR_BODY//'${SOURCE_REPO}'/"${SOURCE_REPO}"}
+
+# shellcheck disable=SC2016
+PR_TITLE=${PR_TITLE//'${TEMPLATE_GIT_HASH}'/"${TEMPLATE_GIT_HASH}"}
+# shellcheck disable=SC2016
+PR_TITLE=${PR_TITLE//'${SOURCE_REPO}'/"${SOURCE_REPO}"}
+
+debug "TEMPLATE_GIT_HASH ${TEMPLATE_GIT_HASH}"
+debug "PR_BRANCH ${PR_BRANCH}"
+debug "PR_BODY ${PR_BODY}"
 
 # Check if the Ignore File exists inside .github folder or if it doesn't exist at all
 if [[ -f ".github/${TEMPLATE_SYNC_IGNORE_FILE_PATH}" || ! -f "${TEMPLATE_SYNC_IGNORE_FILE_PATH}" ]]; then
@@ -68,11 +84,14 @@ fi
 # set the gh action outputs if run with github action.
 # Arguments:
 #   pr_branch
+#   template_git_hash
 #######################################
 function set_github_action_outputs() {
   echo "::group::set gh action outputs"
 
   local pr_branch=$1
+  local template_git_hash=$2
+
   info "set github action outputs"
 
   if [[ -z "${GITHUB_RUN_ID}" ]]; then
@@ -80,6 +99,7 @@ function set_github_action_outputs() {
   else
     # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter
     echo "pr_branch=${pr_branch}" >> "$GITHUB_OUTPUT"
+    echo "template_git_hash=${template_git_hash}" >> "$GITHUB_OUTPUT"
   fi
   echo "::endgroup::"
 }
@@ -359,7 +379,7 @@ function prechecks() {
     warn "skipping prechecks because we force push and pr"
     return 0
   fi
-  check_branch_remote_existing "${NEW_BRANCH}"
+  check_branch_remote_existing "${PR_BRANCH}"
 
   check_if_commit_already_in_hist_graceful_exit "${TEMPLATE_REMOTE_GIT_HASH}"
 
@@ -373,8 +393,8 @@ function checkout_branch_and_pull() {
 
   echo "::group::checkout branch and pull"
 
-  debug "create new branch from default branch with name ${NEW_BRANCH}"
-  git checkout -b "${NEW_BRANCH}"
+  debug "create new branch from default branch with name ${PR_BRANCH}"
+  git checkout -b "${PR_BRANCH}"
   debug "pull changes from template"
 
   pull_source_changes "${SOURCE_REPO}" "${GIT_REMOTE_PULL_PARAMS}"
@@ -437,7 +457,7 @@ function push_prepare_pr_create_pr() {
   echo "::group::push changes and create PR"
 
   cmd_from_yml "prepush"
-  push "${NEW_BRANCH}" "${IS_FORCE_PUSH_PR}"
+  push "${PR_BRANCH}" "${IS_FORCE_PUSH_PR}"
   cmd_from_yml "prepr"
   if [ "$IS_FORCE_PUSH_PR" == true ] ; then
     create_or_edit_pr "${PR_TITLE}" "${PR_BODY}" "${UPSTREAM_BRANCH}" "${PR_LABELS}" "${PR_REVIEWERS}"
@@ -458,4 +478,4 @@ commit
 
 push_prepare_pr_create_pr
 
-set_github_action_outputs "${NEW_BRANCH}"
+set_github_action_outputs "${PR_BRANCH}" "${TEMPLATE_GIT_HASH}"
diff --git a/templatesync.yml b/templatesync.yml
index f8eb2ec..d01a773 100644
--- a/templatesync.yml
+++ b/templatesync.yml
@@ -1,10 +1,10 @@
 # validate
 
 hooks:
-  install:
+  prepull:
     commands:
       - echo "foo ${MY_VAR}"
-      - echo 'hi, we are within the prepush phase'
+      - echo 'hi, we are within the prepull phase'
 
   prepush:
     commands: