add CI workflow

* silence lint errors in certain errchecks
* golangci-lint: skip go installation step
* silence lint error in ResponseWriter Write call

Fixes #13

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: GitHub Actions Demo
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v3
+        with:
+          go-version: 1.19
+      - uses: actions/checkout@v3
+      - name: "fmt"
+        run: test -z $(go fmt ./...)
+      - name: lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: latest
+          skip-go-intallation: true
+          skip-pkg-cache: true
+          skip-build-cache: true
+          args: --timeout 2m
+      - name: test
+        run: go test ./...

cmd/themis-server/main.go

@@ -528,7 +528,7 @@ func handleClaimAutocomplete(ctx context.Context, store *themis.Store, s *discor
 
 func serve(address string) error {
 	http.Handle("/health", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte("OK"))
+		w.Write([]byte("OK")) //nolint:errcheck // this is expected to always work, 'trust me bro' guaranteed
 	}))
 
 	return http.ListenAndServe(address, nil)

store.go

@@ -96,7 +96,7 @@ func (s *Store) Claim(ctx context.Context, userId, player, province string, clai
 	if err != nil {
 		return 0, fmt.Errorf("failed to begin transaction: %w", err)
 	}
-	defer tx.Commit()
+	defer tx.Commit() //nolint:errcheck
 
 	conflicts, err := s.FindConflicts(ctx, userId, province, claimType)
 	if err != nil {

store_test.go

@@ -1,3 +1,4 @@
+//nolint:errcheck
 package themis
 
 import (