only build each image when there are changes to that image

Author: rustyjux

.github/workflows/dev.yml

@@ -73,7 +73,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: Check if build needed
+        id: check
+        run: |
+          if git diff --name-only ${{ github.event.before }} ${{ github.event.after }} | grep -q "^microservices/gatewayApi/\|^.github/workflows/dev.yml"; then
+            echo "build_needed=true" >> $GITHUB_OUTPUT
+          else
+            echo "build_needed=false" >> $GITHUB_OUTPUT
+          fi
+      - name: Skip message
+        if: steps.check.outputs.build_needed == 'false'
+        run: echo "No changes in gatewayApi, skipping build"
       - uses: docker/build-push-action@v1
+        if: steps.check.outputs.build_needed == 'true'
         with:
           registry: docker.pkg.github.com
           username: $GITHUB_ACTOR
@@ -92,7 +104,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: Check if build needed
+        id: check
+        run: |
+          if git diff --name-only ${{ github.event.before }} ${{ github.event.after }} | grep -q "^microservices/gatewayJobScheduler/\|^.github/workflows/dev.yml"; then
+            echo "build_needed=true" >> $GITHUB_OUTPUT
+          else
+            echo "build_needed=false" >> $GITHUB_OUTPUT
+          fi
+      - name: Skip message
+        if: steps.check.outputs.build_needed == 'false'
+        run: echo "No changes in gatewayJobScheduler, skipping build"
       - uses: docker/build-push-action@v1
+        if: steps.check.outputs.build_needed == 'true'
         with:
           registry: docker.pkg.github.com
           username: $GITHUB_ACTOR
@@ -111,7 +135,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: Check if build needed
+        id: check
+        run: |
+          if git diff --name-only ${{ github.event.before }} ${{ github.event.after }} | grep -q "^microservices/kubeApi/\|^.github/workflows/dev.yml"; then
+            echo "build_needed=true" >> $GITHUB_OUTPUT
+          else
+            echo "build_needed=false" >> $GITHUB_OUTPUT
+          fi
+      - name: Skip message
+        if: steps.check.outputs.build_needed == 'false'
+        run: echo "No changes in kubeApi, skipping build"
       - uses: docker/build-push-action@v1
+        if: steps.check.outputs.build_needed == 'true'
         with:
           registry: docker.pkg.github.com
           username: $GITHUB_ACTOR