workflows: Add build workflow

.gitea/workflows/build.yaml

@@ -0,0 +1,26 @@
+name: Build artifact
+run-name: Build from ${{ gitea.actor }} 🚀
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.21
+
+    - name: Build
+      run: go build -v ./...
+
+    - name: Test
+      run: go test -v ./...
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v2.2.3
+      with:
+        name: InnkeeperBot
+        path: ./InnkeeperBot