ci: configure ci workflow

.github/workflows/go.yml

@@ -0,0 +1,30 @@
+name: CI
+"on":
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["master"]
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '1.21'
+      - uses: actions/cache@v3
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+      - name: Build
+        run: go build -v
+      - name: Test
+        run: go test -v
+      - name: Vet
+        run: go vet
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.53.3

.gitignore

@@ -1 +1,2 @@
 /.gitstrap.yml
+/envdoc