feat: migrate from GitLab CI to Gitea Actions

- Update git remote to git.unbound.se
- Add Gitea workflows: ci.yaml, pre-commit.yaml, release.yaml, goreleaser.yaml
- Delete .gitlab-ci.yml
- Update Go module path to gitea.unbound.se/unboundsoftware/schemas
- Update all imports to new module path
- Update Docker registry to oci.unbound.se
- Update .goreleaser.yml for Gitea releases with internal cluster URL
- Remove GitLab CI linter from pre-commit config
- Use shared release workflow with tag_only for versioning

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -0,0 +1,89 @@
+name: schemas
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+    inputs:
+      deploy_prod:
+        description: 'Deploy to production'
+        required: false
+        default: 'false'
+        type: boolean
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
+        with:
+          go-version: 'stable'
+      - name: Generate and format check
+        run: |
+          go install mvdan.cc/gofumpt@latest
+          go install golang.org/x/tools/cmd/goimports@latest
+          go generate ./...
+          git diff --stat --exit-code
+      - name: Run tests
+        run: go test -race -coverprofile=coverage.txt ./...
+
+  vulnerabilities:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
+        with:
+          go-version: 'stable'
+      - name: Check vulnerabilities
+        run: |
+          go install golang.org/x/vuln/cmd/govulncheck@latest
+          govulncheck ./...
+
+  check-release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-go@v6
+        with:
+          go-version: 'stable'
+      - name: Check goreleaser config
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          version: '~> v2'
+          args: check
+      - name: Test release build
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          version: '~> v2'
+          args: release --snapshot --clean
+
+  build:
+    needs: [check, vulnerabilities, check-release]
+    runs-on: ubuntu-latest
+    env:
+      BUILDTOOLS_CONTENT: ${{ secrets.BUILDTOOLS_CONTENT }}
+      GITEA_REPOSITORY: ${{ gitea.repository }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: buildtool/setup-buildtools-action@v1
+      - name: Build and push
+        run: unset GITEA_TOKEN && build && push
+
+  deploy-prod:
+    needs: build
+    if: gitea.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    env:
+      BUILDTOOLS_CONTENT: ${{ secrets.BUILDTOOLS_CONTENT }}
+      GITEA_REPOSITORY: ${{ gitea.repository }}
+    environment: prod
+    steps:
+      - uses: actions/checkout@v6
+      - uses: buildtool/setup-buildtools-action@v1
+      - name: Deploy to production
+        run: deploy prod