generate releases on tags as part of CI

.github/workflows/main.yml

@@ -1,11 +1,8 @@
-name: build
-
+name: ci
 on: push
-
 jobs:
-  build:
+  test:
     runs-on: ubuntu-latest
-
     steps:
     - name: checkout
       uses: actions/checkout@v2
@@ -18,3 +15,16 @@ jobs:
 
     - name: acceptance-test
       run: make docker-acceptance
+
+  goreleaser:
+    runs-on: ubuntu-latest
+    needs: test
+    if: startsWith(github.ref, 'refs/tags/v')
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+
+      - name: goreleaser
+        run: make release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}