CI: add workspace build/test workflow; clones skara-brae-common to the absolute path expected by the sb-common path dependency

.gitea/workflows/build.yml

@@ -0,0 +1,22 @@
+name: build
+on: [push, workflow_dispatch]
+
+jobs:
+  build-test:
+    runs-on: docker
+    container: rust:1-bookworm
+    timeout-minutes: 25
+    steps:
+      - name: Checkout
+        run: git clone --depth 1 ${{ github.server_url }}/${{ github.repository }}.git .
+
+      # sb-common is a path dependency pinned to this absolute path
+      # (see crates/*/Cargo.toml); clone it there before building.
+      - name: Checkout sb-common
+        run: git clone --depth 1 ${{ github.server_url }}/jan/skara-brae-common.git /home/jan/Development/skara-brae/skara-brae-common
+
+      - name: Build
+        run: cargo build --workspace
+
+      - name: Test
+        run: cargo test --workspace --quiet