feeling my way through github CI

Signed-off-by: Tim Bray <tbray@textuality.com>

.github/workflows/go.yaml → .github/workflows/lint.yaml

@@ -1,28 +1,12 @@
-name: Go
+name: Lint
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
-    branches: [master]
+    branches: [main]
 
 jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: Set up Go
-        uses: actions/setup-go@v2
-        with:
-          go-version: 1.14
-
-      - name: Build
-        run: make build
-
-      - name: Test
-        run: make test
-
   lint:
     name: Code Linting
     strategy: