ci: add build+test workflow for main and PRs

.gitea/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      DOTNET_ROOT: /home/mika/.dotnet
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Build
+        run: |
+          set -euo pipefail
+          export PATH="$DOTNET_ROOT:$PATH"
+          dotnet build ClaudeMailbox.slnx -c Release
+
+      - name: Test
+        run: |
+          set -euo pipefail
+          export PATH="$DOTNET_ROOT:$PATH"
+          dotnet test tests/ClaudeMailbox.Tests/ClaudeMailbox.Tests.csproj \
+            -c Release --no-build --logger "console;verbosity=normal"