feat: update build workflow to include base image checks and build steps

.gitea/workflows/build.yml

@@ -1,4 +1,4 @@
-name: Build Backend Application and Docker Image
+name: Build Worker Base and Application Images
 
 on:
   push:
@@ -7,8 +7,56 @@ on:
       - dev
   workflow_dispatch:
 
-jobs:   
+jobs:
+  check-base-changes:
+    runs-on: ubuntu-latest
+    outputs:
+      base-changed: ${{ steps.changes.outputs.base-changed }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 2
+      - name: Check for base changes
+        id: changes
+        run: |
+          if git diff HEAD^ HEAD --name-only | grep -E "(Dockerfile\.base|requirements\.base\.txt)" > /dev/null; then
+            echo "base-changed=true" >> $GITHUB_OUTPUT
+          else
+            echo "base-changed=false" >> $GITHUB_OUTPUT
+          fi
+
+  build-base:
+    needs: check-base-changes
+    if: needs.check-base-changes.outputs.base-changed == 'true' || github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.siwatsystem.com
+          username: ${{ github.actor }}
+          password: ${{ secrets.RUNNER_TOKEN }}
+        
+      - name: Build and push base Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./Dockerfile.base
+          push: true
+          tags: git.siwatsystem.com/adsist-cms/worker-base:latest
+
   build-docker:
+    needs: [check-base-changes, build-base]
+    if: always() && (needs.build-base.result == 'success' || needs.build-base.result == 'skipped')
     runs-on: ubuntu-latest
     permissions:
       packages: write