Extend start-proxy.yml to test multiple registry support

pr-checks/checks/start-proxy.yml

@@ -16,7 +16,17 @@ steps:
     id: proxy
     uses: ./../action/start-proxy
     with:
-      registry_secrets: '[{ "type": "nuget_feed", "url": "https://api.nuget.org/v3/index.json" }]'
+      registry_secrets: |
+        [
+          {
+            "type": "maven-repository",
+            "url": "https://acme.jfrog.io/artifactory/my-maven-registry"
+          },
+          {
+            "type": "maven-repository",
+            "url": "https://repo1.maven.org/maven2"
+          }
+        ]
 
   - name: Print proxy outputs
     run: |
@@ -27,3 +37,15 @@ steps:
   - name: Fail if proxy outputs are not set
     if: (!steps.proxy.outputs.proxy_host) || (!steps.proxy.outputs.proxy_port) || (!steps.proxy.outputs.proxy_ca_certificate) || (!steps.proxy.outputs.proxy_urls)
     run: exit 1
+
+  - name: Validate proxy_urls contains expected registries
+    env:
+      PROXY_URLS: ${{ steps.proxy.outputs.proxy_urls }}
+    run: |
+      jq --null-input --exit-status '
+        env.PROXY_URLS
+        | fromjson
+        | length == 2 and
+          any(.[]; .type=="maven-repository" and .url=="https://acme.jfrog.io/artifactory/my-maven-registry") and
+          any(.[]; .type=="maven-repository" and .url=="https://repo1.maven.org/maven2")
+      '