improve docker release bootstrap (#1136)

.github/workflows/release.yaml

@@ -160,6 +160,9 @@ jobs:
 
   release-docker-assets:
     needs: [release]
+    # code signing requires we run on mac-os runners. docker does not come installed on the mac-os runner
+    # a previous release process installed and configured docker on the mac-os runner which lead to blocked releases
+    # the anchore tools team opted to break this step out to a separate process to remove this work constraint
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -180,5 +183,18 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Restore go cache
+        id: go-cache
+        uses: actions/cache@v2.1.3
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-${{ env.GO_VERSION }}-
+
+      - name: (cache-miss) Bootstrap all project dependencies
+        if: steps.tool-cache.outputs.cache-hit != 'true' || steps.go-cache.outputs.cache-hit != 'true'
+        run: make bootstrap
+
       - name: Build & Publish docker images
         run: make release-docker-assets