add workflow dispatch build number as input

Author: mama-samba-braima

.github/workflows/deploy.yml

@@ -3,6 +3,12 @@ on:
   push:
     branches:
       - main
+  workflow_dispatch:
+    inputs:
+      build_number:
+        description: "The build number to deploy (optional)"
+        required: false
+        type: string
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest
@@ -16,23 +22,41 @@ jobs:
 
     steps:
       - name: Checkout
+        if: ${{ github.event.inputs.build_number == '' }}
         uses: actions/checkout@v4
       - name: JDK
+        if: ${{ github.event.inputs.build_number == '' }}
         uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
           java-version: '21'
       - name: Generate Build Number
         run: |
-          BUILD_NUMBER=$(date +'%d%m%Y%H%M%S')
+          if [ -n "${{ github.event.inputs.build_number }}"]; then
+            BUILD_NUMBER = ${{ github.event.inputs.build_number }}
+            echo "using provided build number: $BUILD_NUMBER"
+          else
+            BUILD_NUMBER=$(date +'%d%m%Y%H%M%S')
+            echo "using generated build number: $BUILD_NUMBER"
+          fi
           echo "BUILD_NUMBER=$BUILD_NUMBER" >> $GITHUB_ENV
-          echo "Generated Build Number: $BUILD_NUMBER"
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
           username: ${{ env.DOCKER_USERNAME }}
           password: ${{ env.DOCKER_PASSWORD }}
+      - name: Check if provided docker image exists
+        if: ${{ github.event.inputs.build_number != '' }}
+        run: |
+          IMAGE_NAME="${{ env.DOCKER_USERNAME }}/${{ env.DOCKER_IMAGE_NAME }}:$BUILD_NUMBER"
+          echo "checking if $IMAGE_NAME exists"
+          if ! docker manifest inspect "$IMAGE_NAME" > /dev/null 2>&1; then
+            echo "provided image $IMAGE_NAME does not exits. exiting..."
+            exit 1
+          fi
+          echo "provided image $IMAGE_NAME exits ✅"
       - name: Maven Clean Verify
+        if: ${{ github.event.inputs.build_number == '' }}
         run: mvn -B -ntp clean verify jib:build -Ddocker.image.tag=$BUILD_NUMBER
       - name: Setup SSH Agent
         uses: webfactory/ssh-agent@v0.9.0