ci: update actions to current versions, test against "go.mod", "oldstable", "stable

.github/workflows/test.yml

@@ -13,71 +13,48 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
-on:
-  push:
-  pull_request:
+on: [push, pull_request]
 
 jobs:
-
-  linux:
-    name: Test ${{ matrix.platform }} (${{ matrix.go }})
+  ci:
+    name: ${{ matrix.platform }} (${{ matrix.go-version || 'oldest' }})
     timeout-minutes: 10
     strategy:
       fail-fast: false
       matrix:
-        go: ["1.18.x", "oldstable", "stable"]
-        platform: [ubuntu-24.04]
-    runs-on: ${{ matrix.platform }}
-    steps:
-    - name: Install Go ${{ matrix.go }}
-      uses: actions/setup-go@v5
-      with:
-        go-version: ${{ matrix.go }}
-    - name: Setup IPv6
-      run: sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0 net.ipv6.conf.default.disable_ipv6=0 net.ipv6.conf.all.disable_ipv6=0
-    - name: Checkout code
-      uses: actions/checkout@v4
-    - name: Build for ${{ matrix.platform }}
-      run: go build ./...
-    - name: Test
-      run: go test -exec sudo -v ./...
+        go-version:
+          - "" # do not specify go-version to fall back on go-version-file (use go.mod); see https://github.com/actions/setup-go/issues/450#issuecomment-3620402646
+          - "oldstable"
+          - "stable"
+        platform: [ubuntu-24.04, windows-latest, macos-latest]
+        include:
+          - platform: ubuntu-24.04
+            test-cmd: go test -exec sudo -v ./...
+            ipv6: true
+          - platform: windows-latest
+            test-cmd: go test -v ./...
+            ipv6: false
+          - platform: macos-latest
+            test-cmd: go test -v ./...
+            ipv6: false
 
-  other:
-    name: Test ${{ matrix.platform }} (${{ matrix.go }})
-    timeout-minutes: 10
-    strategy:
-      fail-fast: false
-      matrix:
-        go: ["1.18.x", "oldstable", "stable"]
-        platform: [windows-latest, macos-latest]
     runs-on: ${{ matrix.platform }}
     steps:
-      - name: Install Go ${{ matrix.go }}
-        uses: actions/setup-go@v5
-        with:
-          go-version: ${{ matrix.go }}
+      - name: Setup IPv6
+        if: matrix.ipv6
+        run: sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0 net.ipv6.conf.default.disable_ipv6=0 net.ipv6.conf.all.disable_ipv6=0
       - name: Checkout code
-        uses: actions/checkout@v4
-      - name: Build for ${{ matrix.platform }}
-        run: go build ./...
-      - name: Test
-        run: go test -v ./...
-
-  lint:
-    name: Lint ${{ matrix.platform }}
-    timeout-minutes: 10
-    strategy:
-      fail-fast: false
-      matrix:
-        platform: [ubuntu-24.04, windows-latest, macos-latest]
-    runs-on: ${{ matrix.platform }}
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
+        uses: actions/checkout@v6
+      - name: Install Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v6
         with:
-          go-version: "stable"
-          cache: false
-      - name: golangci-lint
-        uses: golangci/golangci-lint-action@v7
+          go-version: ${{ matrix.go-version }}
+          go-version-file: "go.mod" # used when go-version is not specified.
+      - name: Lint
+        uses: golangci/golangci-lint-action@v9
         with:
-          args: --timeout=5m
+          args: --timeout=5m --verbose
+      - name: Build
+        run: go build ./...
+      - name: Test
+        run: ${{ matrix.test-cmd }}