ci: parameterize registry and add zot as another candidate

Signed-off-by: Ramkumar Chinchani <rchincha@cisco.com>

.github/workflows/build.yml

@@ -28,6 +28,9 @@ jobs:
     strategy:
       matrix:
         go-version: [1.19]
+        registry:
+          - ghcr.io/oras-project/registry:v1.0.0-rc.2
+          - ghcr.io/project-zot/zot-minimal-linux-amd64:latest
       fail-fast: true
     steps:
       - name: Checkout
@@ -57,7 +60,7 @@ jobs:
             --env REGISTRY_AUTH_HTPASSWD_PATH=/etc/docker/registry/passwd \
             --mount type=bind,source=$mnt_root/docker,target=/opt/data/registry-root-dir/docker \
             --mount type=bind,source=$mnt_root/passwd_bcrypt,target=/etc/docker/registry/passwd \
-            ghcr.io/oras-project/registry:v1.0.0-rc.2
+            ${{ matrix.registry }}
           ginkgo -r -p --succinct suite
           docker kill oras-e2e || true
         env:

.github/workflows/ecosystem.yml

@@ -0,0 +1,37 @@
+name: "OCI Ecosystem Compatibility"
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches: [main]
+  release:
+    types:
+      - published
+
+permissions: read-all
+
+jobs:
+  oci-registry:
+    name: Check OCI registry
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
+        with:
+          go-version: 1.19.x
+      - name: Install dependencies
+        run: |
+          apt-get update && apt-get -y install curl
+      - name: Start OCI registry
+        run: |
+          docker run -p 5000:5000 ghcr.io/project-zot/zot-minimal-linux-amd64:latest
+          while true; do \
+            curl -f http://localhost:5000/v2/; \
+            if [ $? -eq 0 ]; then \
+              break; \
+            fi; \
+            sleep 1; \
+          done
+      - name: