Switching to Docker image of Specmatic for Backward Compatibility Check

.github/workflows/pull_request_merge_checks.yaml

@@ -13,19 +13,13 @@ jobs:
     runs-on: ubuntu-latest
     name: Check API Contracts
     steps:
-      - name: Set up JDK 17
-        uses: actions/setup-java@v4
-        with:
-          java-version: '17'
-          distribution: 'temurin'
-
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0  # OR "2" -> To retrieve the preceding commit.
 
       - uses: actions/setup-node@v2
         with:
-          node-version: '16'
+          node-version: '20'
 
       - name: Get changed yaml files
         id: changed-files-specific
@@ -46,14 +40,10 @@ jobs:
         run: |
           echo "Running Spectral linter on: ${{ steps.changed-files-specific.outputs.all_changed_files }}"
           spectral lint in/**/*.yaml
-      
-      - name: Setup specmatic
-        uses: airslate-oss/setup-specmatic@v1
-        with:
-          specmatic-version: 1.3.16
-
+    
       - name: Run backward compatibility check on changed files
         if: steps.changed-files-specific.outputs.any_changed == 'true'
         run: |
-          echo "Running backward compatibility checks"
-          specmatic backwardCompatibilityCheck
+          docker run -v "$(pwd):/central-contract-repo:rw" \ (git)-[BC-command-test] 
+            --entrypoint /bin/sh znsio/specmatic \
+            -c "cd /central-contract-repo && java -jar /usr/src/app/specmatic.jar backwardCompatibilityCheck"