Move publishing of REST sample Image from AZP to GHA

This patch moves publishing of REST sample image from AZP to GHA.
This was the last job running on AZP.
Also, this patch will fix an error encounterd during the image build.
Publishing of REST sample image is now only executed when pushing to main.

Signed-off-by: Tatsuya Sato <tatsuya.sato.so@hitachi.com>

.github/workflows/rest-sample.yaml

@@ -45,3 +45,14 @@ jobs:
       - name: Test REST Sample Application
         run: npm test
         working-directory: asset-transfer-basic/rest-api-typescript
+
+      - name: Build REST Sample Docker Image
+        run: docker build -t ghcr.io/hyperledger/fabric-rest-sample .
+        working-directory: asset-transfer-basic/rest-api-typescript
+
+      - name: Publish REST Sample Docker Image
+        if: github.event_name == 'push' && (github.ref == 'refs/heads/main')
+        run: |
+          echo ${{ secrets.GITHUB_PAT }} | docker login ghcr.io -u ${{ secrets.GITHUB_USER }} --password-stdin
+          docker push ghcr.io/hyperledger/fabric-rest-sample:latest
+        working-directory: asset-transfer-basic/rest-api-typescript