feat: add reusable .NET build & test workflow

Co-Authored-By: Claude Opus 5.5 <[email protected]>

.gitea/workflows/dotnet-build-test.yaml

@@ -0,0 +1,79 @@
+name: .NET Build & Test (Reusable)
+
+on:
+  workflow_call:
+    inputs:
+      solution:
+        description: "Solution/project file to build (relative to working-directory). Empty = let dotnet pick the single sln/proj in working-directory"
+        required: false
+        default: ""
+        type: string
+      dotnet-version:
+        description: ".NET SDK version"
+        required: false
+        default: "10.0.x"
+        type: string
+      configuration:
+        description: "Build configuration"
+        required: false
+        default: "Release"
+        type: string
+      warnaserror:
+        description: "Treat build warnings as errors"
+        required: false
+        default: true
+        type: boolean
+      working-directory:
+        description: "Path where dotnet commands are executed (relative to repo root)"
+        required: false
+        default: "."
+        type: string
+      test-filter:
+        description: "Optional dotnet test --filter expression"
+        required: false
+        default: ""
+        type: string
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    env:
+      DOTNET_CLI_TELEMETRY_OPTOUT: "1"
+      DOTNET_NOLOGO: "1"
+      SOLUTION: ${{ inputs.solution }}
+      CONFIGURATION: ${{ inputs.configuration }}
+      WARNASERROR: ${{ inputs.warnaserror }}
+      TEST_FILTER: ${{ inputs.test-filter }}
+
+    defaults:
+      run:
+        shell: bash
+        working-directory: ${{ inputs.working-directory }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ inputs.dotnet-version }}
+
+      - name: Restore
+        run: dotnet restore ${SOLUTION:+"$SOLUTION"}
+
+      - name: Build
+        run: |
+          ARGS=(-c "$CONFIGURATION" --no-restore)
+          if [ "$WARNASERROR" = "true" ]; then
+            ARGS+=(-warnaserror)
+          fi
+          dotnet build ${SOLUTION:+"$SOLUTION"} "${ARGS[@]}"
+
+      - name: Test
+        run: |
+          ARGS=(-c "$CONFIGURATION" --no-build)
+          if [ -n "$TEST_FILTER" ]; then
+            ARGS+=(--filter "$TEST_FILTER")
+          fi
+          dotnet test ${SOLUTION:+"$SOLUTION"} "${ARGS[@]}"

README.md

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+# dotnet-build-test
+
+Reusable Gitea Actions workflow: `dotnet restore` → `build` → `test`, with no Docker. Meant as a PR gate, for example so Renovate can automerge.
+
+## Usage
+
+```yaml
+on:
+  pull_request:
+
+jobs:
+  build-test:
+    uses: templates/dotnet-build-test/.gitea/workflows/dotnet-build-test.yaml@v1
+    with:
+      solution: MyApp.slnx
+      # dotnet-version: 10.0.x
+      # configuration: Release
+      # warnaserror: true
+      # working-directory: .
+      # test-filter: "Category!=Integration"
+```
+
+## Inputs
+
+| Name | Default | Description |
+|---|---|---|
+| `solution` | `""` | Solution/project file, relative to `working-directory`. If empty, dotnet uses the single sln/proj in that directory. |
+| `dotnet-version` | `10.0.x` | .NET SDK version |
+| `configuration` | `Release` | Build configuration |
+| `warnaserror` | `true` | Pass `-warnaserror` to `dotnet build` |
+| `working-directory` | `.` | Where dotnet commands run |
+| `test-filter` | `""` | Optional `dotnet test --filter` expression |
+
+No secrets.
+
+## Versioning
+
+Only major tags (`v1`, `v2`, …). Fixes and new optional inputs move the existing tag. Changing or removing inputs, or changing behavior, needs a new major tag.