DNS: run GCS provider tests

.github/workflows/provider-gcs.yml

@@ -0,0 +1,38 @@
+name: Providers - GCS
+on:
+  push:
+    branches: [ test/provider-gcs, refactor/gcs-client ]
+  workflow_dispatch:
+    inputs:
+      ref:
+        description: 'branch or git ref to use for the build'
+        required: true
+        default: 'test/providers'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  provider-test:
+    name: GCS Provider Test
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      with:
+        fetch-depth: 0
+        ref: ${{ github.event.inputs.ref_name || github.ref }}
+    - name: Set up Go
+      uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
+      with:
+        go-version-file: 'go.mod'
+        check-latest: true
+      id: go
+    - name: Install Dependencies
+      run: make provider-tests-deps
+    - name: GCS
+      run: make provider-tests PROVIDER_TEST_TARGET=gcs
+      env:
+        KOPIA_GCS_CREDENTIALS_JSON_GZIP: ${{ secrets.KOPIA_GCS_CREDENTIALS_JSON_GZIP }}
+        KOPIA_GCS_TEST_BUCKET: ${{ secrets.KOPIA_GCS_TEST_BUCKET }}
+      if: ${{ success() || failure() }}