Tweaks to workflow for releasing

.github/workflows/go.yml

@@ -1,3 +1,5 @@
+# NOTE: this is a duplicate of the release workflow, without the release step.
+# They should be kept in sync or somehow deduplicated.
 name: Go
 
 on:
@@ -9,6 +11,22 @@ on:
 
 jobs:
 
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.16
+
+    - name: Run GoReleaser
+      uses: goreleaser/goreleaser-action@v2
+      with:
+        args: release --rm-dist --snapshot
+
   test:
     runs-on: ubuntu-latest
     steps:
@@ -33,7 +51,8 @@ jobs:
 
   release:
     runs-on: ubuntu-latest
-    needs: [ test, lint ]
+    needs: [ build, test, lint ]
+    if: startsWith(github.ref, 'refs/tags/') # Prevent running releaser on both main and tag
     steps:
     - name: Checkout
       uses: actions/checkout@v2