ci: refactor GitHub Actions workflows and dependencies

- Rename GitHub Actions workflow file from `test.yml` to `testing.yml`
- Change workflow job name from `checks` to `testing`
- Update GitHub Actions `checkout` to version 4
- Remove specific Go version in favor of determining it from `go.mod`
- Update GitHub Actions `setup-go` to version 5
- Update GitHub Actions `cache` to version 4
- Add `golangci-lint` action with specified version and timeout arguments

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

.gitea/workflows/testing.yml

@@ -0,0 +1,39 @@
+name: testing
+on:
+  - push
+  - pull_request
+
+env:
+  GOPATH: /go_path
+  GOCACHE: /go_cache
+
+jobs:
+  lint:
+    name: check and test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # all history for all branches and tags
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+      - uses: https://gitea.com/actions/go-hashfiles@v0.0.1
+        id: hash-go
+        with:
+          patterns: |
+            go.mod
+            go.sum
+      - name: cache go
+        id: cache-go
+        uses: actions/cache@v4
+        with:
+          path: |
+            /go_path
+            /go_cache
+          key: go_path-${{ steps.hash-go.outputs.hash }}
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.56.2
+          args: --timeout 5m