use git builtin instead of find (#1)

Dockerfile updates
update path of reviewdog binary
install reviewdog binary in the same way as they are doing for their own actions

Signed-off-by: Felix Bartels <felix@host-consultants.de>

Dockerfile

@@ -1,10 +1,16 @@
 FROM alpine:3.10
 
-RUN apk add --update --no-cache git
-RUN wget -q https://github.com/hadolint/hadolint/releases/download/v1.17.3/hadolint-Linux-x86_64 -O /bin/hadolint \
-    && chmod +x /bin/hadolint
+ENV \
+    HADOLINT_VERSION=1.17.3 \
+    REVIEWDOG_VERSION=0.9.14
+
+# hadolint ignore=DL3018
+RUN apk add --no-cache git
+RUN wget -q https://github.com/hadolint/hadolint/releases/download/v$HADOLINT_VERSION/hadolint-Linux-x86_64 -O /usr/local/bin/hadolint \
+    && chmod +x /usr/local/bin/hadolint
+
+RUN wget -O - -q https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh | sh -s -- -b /usr/local/bin/ v$REVIEWDOG_VERSION
 
 COPY entrypoint.sh /entrypoint.sh
-COPY bin/reviewdog /bin/reviewdog
 
 ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

@@ -4,5 +4,5 @@ cd "$GITHUB_WORKSPACE"
 
 export REVIEWDOG_GITHUB_API_TOKEN="${INPUT_GITHUB_TOKEN}"
 
-find . -name "Dockerfile*" | xargs hadolint \
-  | /bin/reviewdog -efm="%f:%l %m" -name="${INPUT_TOOL_NAME}" -reporter="${INPUT_REPORTER}" -level="${INPUT_LEVEL}"
+git ls-files --exclude='Dockerfile*' --ignored | xargs hadolint \
+  | reviewdog -efm="%f:%l %m" -name="${INPUT_TOOL_NAME}" -reporter="${INPUT_REPORTER}" -level="${INPUT_LEVEL}"