diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
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+name: CI
+
+# Gitea Actions is GitHub-Actions-compatible: drop this in .gitea/workflows/, enable Actions on the
+# repo ([actions] ENABLED=true in app.ini, Gitea >= 1.19) and register an act_runner — it then runs
+# on every push / PR just like the GitHub workflow. This mirrors .github/workflows/ci.yml but installs
+# Godot and gdtoolkit with plain shell steps instead of the chickensoft setup-godot action, because a
+# self-hosted runner usually can't reach the GitHub action registry (unless DEFAULT_ACTIONS_URL is set
+# to proxy github.com). Only actions/checkout and actions/upload-artifact remain as external actions —
+# both ship with Gitea's default proxy; if yours is offline, mirror them into your instance.
+
+on:
+  push:
+  pull_request:
+
+env:
+  # The Godot build the team runs (godot --version -> 4.7.beta.custom_build.417cd33bf). Pin this to a
+  # PUBLISHED build from https://github.com/godotengine/godot-builds/releases. If you run a custom
+  # build with no public binary, host the linux headless zip where the runner can reach it and set
+  # GODOT_URL to that (it overrides the constructed URL below).
+  GODOT_VERSION: "4.7-beta1"
+  GODOT_URL: ""
+
+jobs:
+  test:
+    name: Lint & headless tests
+    runs-on: ubuntu-latest # must match a label your act_runner registered with
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Godot ${{ env.GODOT_VERSION }}
+        run: |
+          set -eux
+          url="${GODOT_URL:-https://github.com/godotengine/godot-builds/releases/download/${GODOT_VERSION}/Godot_v${GODOT_VERSION}_linux.x86_64.zip}"
+          curl -fL "$url" -o /tmp/godot.zip
+          unzip -o /tmp/godot.zip -d /tmp/godot
+          install -m 755 /tmp/godot/Godot_v*_linux.x86_64 /usr/local/bin/godot
+          godot --version
+
+      - name: Install gdlint (gdtoolkit)
+        # A venv sidesteps PEP-668 "externally managed" pip on recent runner images; putting its bin on
+        # GITHUB_PATH lets run_tests.sh call bare `gdlint` in later steps.
+        run: |
+          set -eux
+          python3 -m venv /tmp/venv
+          /tmp/venv/bin/pip install "gdtoolkit==4.*"
+          echo "/tmp/venv/bin" >> "$GITHUB_PATH"
+
+      # First run imports assets and builds the .godot cache (gitignored) so headless tests can load
+      # the .glb/.png resources they instance. Import can exit non-zero on warnings.
+      - name: Import resources
+        run: godot --headless --import
+        continue-on-error: true
+
+      - name: gdlint
+        run: gdlint *.gd levels/*.gd tests/*.gd
+
+      - name: Headless tests
+        env:
+          GODOT: godot
+        run: bash run_tests.sh --no-gameplay
+
+      - name: Upload test output on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-output
+          path: tests/output/
+          if-no-files-found: ignore