ISS-1594287: CI workflow optimisations

.github/workflows/docker-publish.yml

@@ -21,12 +21,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Login to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.PUBLIC_DOCKER_USERNAME }}
-          password: ${{ secrets.PUBLIC_DOCKER_PASSWORD }}
-
       - name: Get Build Info
         id: build_info
         run: |
@@ -42,21 +36,26 @@ jobs:
         run: |
           if [[ "${GITHUB_REF}" == refs/tags/* ]]; then
             IMAGE_TAG="${GITHUB_REF#refs/tags/}"
-            echo "tags=razorpay/ifsc:${IMAGE_TAG},razorpay/ifsc:latest" >> $GITHUB_OUTPUT
+            echo "custom_tag=${IMAGE_TAG}" >> $GITHUB_OUTPUT
           else
             # Use the trigger SHA instead of the merge commit SHA
             IMAGE_TAG="${{ steps.build_info.outputs.trigger_sha }}"
-            echo "tags=razorpay/ifsc:${IMAGE_TAG}" >> $GITHUB_OUTPUT
+            echo "custom_tag=${IMAGE_TAG}" >> $GITHUB_OUTPUT
           fi
 
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.PUBLIC_DOCKER_USERNAME }}
+          password: ${{ secrets.PUBLIC_DOCKER_PASSWORD }}
+
       - name: Build & Push
         uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64
           push: true
-          tags: ${{ steps.vars.outputs.tags }}
-          # No special network configuration or REDIS_HOST arguments are needed.
+          tags: razorpay/ifsc:${{ steps.vars.outputs.custom_tag }}
           build-args: |
             VERSION=${{ github.ref_name }}
             COMMIT=${{ steps.build_info.outputs.trigger_sha }}

Dockerfile

@@ -1,4 +1,4 @@
 FROM --platform=linux/amd64 ruby:3.1-alpine3.18 AS rdbbuilder
 
 # Set the working directory
 WORKDIR /app
@@ -10,18 +10,21 @@
     BUNDLE_GEMFILE="Gemfile.build"
 ENV PATH="/app/vendor/bundle/bin:$PATH"
 
-# Copy build-specific files
-COPY Gemfile.build* init.rb /app/
-COPY data /app/data/
-
 # Layer 1: Install OS dependencies and the correct Bundler version.
-RUN echo "** Builder: Installing OS and Bundler dependencies... **" && \
-    apk --no-cache add redis && \
+RUN apk --no-cache add redis && \
     gem install bundler -v 2.4.10
 
+# Copy dependency files only (cached unless Gemfile.build changes)
+COPY Gemfile.build* /app/
+
 # Layer 2: Install the application's gems.
-RUN echo "** Builder: Installing gems... **" && \
-    bundle install --jobs=$(nproc) --retry 3
+RUN bundle install --jobs=$(nproc) --retry 3
+
+## Don't change the above lines since these lines are cached with cache image
+
+# Copy build script and data files (cache-busting boundary)
+COPY init.rb /app/
+COPY data /app/data/
 
 # Layer 3: Run the database seeding script.
 RUN echo "** Builder: Starting redis-server in the background... **" && \