ci: clean up workflow (#3)

## Description

The current CI workflow was auto-generated by Claude, and is really not intuitive. Fixing it up to make it work better.

- Add names for jobs in workflow.
- Rename workflow to `ci.yml`.
- Added `go mod tidy` as a tasks in the `lint` job.

### Decisions

- Chose not to use emojis for workflow or job names. While they look nice, they are unprofessional, and harder to `grep`.

Reviewed-on: #3
Co-authored-by: M.V. Hutz <git@maximhutz.me>
Co-committed-by: M.V. Hutz <git@maximhutz.me>

.gitea/workflows/ci.yml

@@ -0,0 +1,69 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  lint:
+    name: Golang Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Check go mod tidy
+        run: go mod tidy && git diff --exit-code go.mod go.sum
+
+      - uses: golangci/golangci-lint-action@v7
+        with:
+          version: latest
+
+  unit-test:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run unit tests
+        run: go test ./... -cover -v
+
+  fuzz-test:
+    name: Fuzz Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run fuzz tests
+        run: |
+          for func in $(grep -r --include='*_test.go' -oh 'func Fuzz\w*' . | sed 's/func //'); do
+            go test ./... -fuzz="^${func}$" -fuzztime=30s
+          done
+
+  mutation-test:
+    name: Mutation Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Install gremlins
+        run: go install github.com/go-gremlins/gremlins/cmd/gremlins@latest
+
+      - name: Run mutation tests
+        run: gremlins unleash