ci: add some basic GHA checks

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

.github/workflows/test.yml

@@ -0,0 +1,90 @@
+name: test
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - main
+      - release-*
+  pull_request:
+env:
+  GO_VERSION: 1.22.x
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    timeout-minutes: 30
+    permissions:
+      contents: read
+      pull-requests: read
+      checks: write # to allow the action to annotate code in the PR.
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "${{ env.GO_VERSION }}"
+      - name: install deps
+        run: |
+          sudo apt -q update
+          sudo apt -qy install libseccomp-dev
+      - uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.57
+      # Extra linters, only checking new code from a pull request.
+      - name: lint-extra
+        if: github.event_name == 'pull_request'
+        run: |
+          golangci-lint run --config .golangci-extra.yml --new-from-rev=HEAD~1
+
+  go-fix:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "${{ env.GO_VERSION }}"
+      - name: run go fix
+        run: |
+          go fix ./...
+          git diff --exit-code
+
+  codespell:
+    runs-on: ubuntu-24.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: install deps
+      # Version of codespell bundled with Ubuntu is way old, so use pip.
+      run: pip install --break-system-packages codespell==v2.3.0
+    - name: run codespell
+      run: codespell
+
+  space-at-eol:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: rm -fr vendor
+      - run: if git -P grep -I -n '\s$'; then echo "^^^ extra whitespace at EOL, please fix"; exit 1; fi
+
+  verify-changelog:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+        # Period before issue/PR references.
+        if ! grep -n '[0-9a-zA-Z][^.] (#[1-9][0-9, #]*)$$' CHANGELOG.md; then echo "^^^ Missing periods in changelog, please fix"; exit 1; fi
+
+  unit:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "${{ env.GO_VERSION }}"
+      - name: run go test
+        run: go test -v ./...