Update action

This reverts commit 4ddc450000.

.gitea/Dockerfile

@@ -0,0 +1,3 @@
+FROM gcc:latest
+
+WORKDIR /workspace

.gitea/workflows/build.yml

@@ -0,0 +1,22 @@
+name: build
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  smoketest:
+    runs-on: x86_64
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v7
+
+      - name: Build container image
+        run: podman build --load -t nob-build -f .gitea/Dockerfile .
+
+      - name: Build project
+        run: podman run --interactive=false --rm -v "$PWD":/workspace -w /workspace nob-build ./build.sh
+             CONTAINER_ID=$(docker run --rm -v "$PWD":/workspace -w /workspace nob-build ./build.sh)
+
+      - name: Run smoketest binary
+        run: podman run --interactive=false --rm -v "$PWD":/workspace -w /workspace nob-build ./a.out