feat(ci): introduce hadolint

For linting of Dockerfile.

.github/workflows/hadolint.yml

@@ -0,0 +1,26 @@
+# Copyright © Michal Čihař <[email protected]>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+# This file is maintained in https://github.com/WeblateOrg/meta/
+name: Hadolint
+
+on:
+  push:
+    branches-ignore:
+    - deepsource-fix-**
+    - renovate/**
+    - weblate
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  hadolint:
+
+    runs-on: ubuntu-24.04
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: hadolint/[email protected]

Dockerfile

@@ -91,6 +91,7 @@ RUN curl -LsSf https://astral.sh/uv/${UV_VERSION}/install.sh | env UV_UNMANAGED_
 # Install supervisor and gunicorn to /opt/tools
 RUN export UV_NO_CACHE=1 && uv venv /opt/tools
 COPY --link requirements.txt /opt/tools/src/requirements.txt
+# hadolint ignore=SC1091
 RUN export UV_NO_CACHE=1 && \
     source /opt/tools/bin/activate && \
     uv pip install -r /opt/tools/src/requirements.txt