Update TESTING.md to include prerequisites for running tests, specifying the need for the Rust toolchain and SSH client.

.gitea/workflows/smoke-tests.yml

@@ -0,0 +1,21 @@
+name: Smoke tests
+on: [push, pull_request]
+
+jobs:
+  smoke:
+    name: Build and smoke test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        run: sudo apt install -y cargo
+
+      - name: clone repository
+        action: actions/checkout@v4
+
+      - name: Build
+        run: cargo build
+
+      - name: Run smoke tests
+        run: ./run-tests.sh