refactor: change pact-transformer publish trigger to version-based check

- Remove tag-based trigger for publishing
- Add version check against npm registry before publishing
- Only publish on main branch push if version is different
- Keep all build and test steps as before

Author: salamaashoush

.github/workflows/pact-transformer-ci.yml

@@ -18,8 +18,6 @@ on:
   push:
     branches:
       - main
-    tags:
-      - "@pact-toolbox/pact-transformer@*"
     paths-ignore:
       - "**/*.md"
       - "LICENSE"
@@ -429,7 +427,7 @@ jobs:
       - test-linux-x64-musl-binding
       - test-linux-aarch64-gnu-binding
       - test-linux-aarch64-musl-binding
-    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/@pact-toolbox/pact-transformer@')
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     steps:
       - uses: actions/checkout@v4
       - name: Setup node
@@ -438,18 +436,39 @@ jobs:
           node-version: 22
       - uses: pnpm/action-setup@v4
 
+      - name: Check if version needs publishing
+        id: version_check
+        run: |
+          cd crates/pact-transformer
+          LOCAL_VERSION=$(node -p "require('./package.json').version")
+          echo "Local version: $LOCAL_VERSION"
+          
+          # Check if package exists on npm
+          if npm view @pact-toolbox/pact-transformer@$LOCAL_VERSION version 2>/dev/null; then
+            echo "Version $LOCAL_VERSION already published"
+            echo "should_publish=false" >> $GITHUB_OUTPUT
+          else
+            echo "Version $LOCAL_VERSION not published yet"
+            echo "should_publish=true" >> $GITHUB_OUTPUT
+          fi
+
       - name: Install dependencies
+        if: steps.version_check.outputs.should_publish == 'true'
         run: pnpm install --frozen-lockfile
       - name: Download all artifacts
+        if: steps.version_check.outputs.should_publish == 'true'
         uses: actions/download-artifact@v4
         with:
           path: crates/pact-transformer/artifacts
       - name: Move artifacts
+        if: steps.version_check.outputs.should_publish == 'true'
         run: cd crates/pact-transformer && pnpm artifacts
       - name: List packages
+        if: steps.version_check.outputs.should_publish == 'true'
         run: ls -R ./crates/pact-transformer/npm
         shell: bash
       - name: Publish
+        if: steps.version_check.outputs.should_publish == 'true'
         run: |
           npm config set provenance true
           cd crates/pact-transformer