STAC-25142 Port CI to GitHub Actions (lint + test)

.github/workflows/ci.yml

@@ -0,0 +1,57 @@
+name: CI
+
+# Ported from .gitlab-ci.yml (lint + test) as part of the GitLab -> GitHub
+# migration (STAC-25142). Public Go library, no secrets/registry needed, so it
+# runs on GitHub-hosted runners with actions/setup-go (Go version from go.mod).
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    name: Lint (gofmt + revive)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Set up Go
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
+        with:
+          go-version-file: go.mod
+
+      - name: Check gofmt
+        run: |
+          unformatted="$(gofmt -l .)"
+          if [ -n "$unformatted" ]; then
+            echo "The following files are not gofmt-formatted:"
+            echo "$unformatted"
+            exit 1
+          fi
+
+      - name: revive
+        run: go run github.com/mgechev/revive@v1.15.0 -formatter stylish -config revive-recommended.toml ./...
+
+  test:
+    name: Test (go test)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Set up Go
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
+        with:
+          go-version-file: go.mod
+
+      - name: go test
+        run: go test -v ./...