Add static analysis stage to workflow (#29)

Use golangci-lint as the tool for the job. See https://golangci-lint.run
for more details on the tool.

Extra: restructure workflow code to be more consistent in sytle.

.github/workflows/check.yml

@@ -0,0 +1,18 @@
+name: check
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+
+jobs:
+  golangci-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v5
+      - uses: actions/checkout@v4
+      - uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.58

.github/workflows/test.yml

@@ -1,18 +1,25 @@
-on: [push, pull_request]
-name: Test
+name: test
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+
 jobs:
-  test:
+  go-test:
     strategy:
       matrix:
         go-version: [1.16.x, 1.19.x]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - name: Install Go
-      uses: actions/setup-go@v5
-      with:
-        go-version: ${{ matrix.go-version }}
-    - name: Checkout code
-      uses: actions/checkout@v4
-    - name: Test
-      run: go test -v -cover ./...
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Test
+        run: go test -v -cover ./...