docker container publishing workflow

.github/workflows/container_publishing.yml

@@ -0,0 +1,43 @@
+name: Docker Image Build & Push to ghrc.io
+
+on:
+    push:
+        branches: [ "main" ]
+        tags: [ "v*.*.*" ]
+    pull_request:
+        branches: [ "main" ]
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout the codebase
+              uses: actions/checkout@v3
+
+            - name: Login to GitHub Container Registry
+              uses: docker/login-action@v1
+              with:
+                registry: ghcr.io
+                username: ${{ github.actor }}
+                password: ${{ secrets.GITHUB_TOKEN }}
+            - name: Extract tag name
+              id: get_tag
+              run: echo ::set-output name=TAG_NAME::${GITHUB_REF#refs/tags/}
+            - name: Use tag name
+              run: echo ${{ steps.get_tag.outputs.TAG_NAME }}
+            - name: Build the Docker image
+              run: |
+                export REG_NS=ghcr.io/vlizbe/
+                TAG_NAME=${GITHUB_REF#refs/tags/}  
+                # build tag is the same as tag name for releases if this matches the semver format else it is latest
+                # The string you want to check
+                # The regular expression
+                regex="^(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(-((0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)(\\.(0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*))?(\\+([0-9a-zA-Z-]+(\\.[0-9a-zA-Z-]+)*))?$"
+                if [[ $TAG_NAME =~ $regex ]]; then
+                export BUILD_TAG=$TAG_NAME
+                else
+                export BUILD_TAG="latest"
+                fi
+                echo $BUILD_TAG
+
+                docker build -t $REG_NS$GITHUB_REPOSITORY_NAME:$BUILD_TAG .
+                docker push $REG_NS$GITHUB_REPOSITORY_NAME:$BUILD_TAG