feat(ci): introduce hadolint

For linting of Dockerfile.

Author: nijel

.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

@@ -16,6 +16,7 @@ LABEL org.opencontainers.image.title="Weblate"
 LABEL org.opencontainers.image.description="A web-based continuous localization system with tight version control integration"
 LABEL org.opencontainers.image.licenses="MIT"
 
+# hadolint ignore=DL3008
 RUN \
   export DEBIAN_FRONTEND=noninteractive \
   && apt-get update \