feat: include supervisor in the base image

Author: nijel

base/Dockerfile

@@ -44,7 +44,7 @@ ENV HOME=/home/weblate
 # Avoid Python buffering stdout and delaying logs
 ENV PYTHONUNBUFFERED=1
 # Add virtualenv to path
-ENV PATH=/app/venv/bin/:/usr/local/bin:/usr/bin:/bin
+ENV PATH=/app/venv/bin:/opt/supervisor/bin:/usr/local/bin:/usr/bin:/bin
 
 # Install dependencies
 # hadolint ignore=DL3008,DL3013,SC2046,DL3003
@@ -87,3 +87,12 @@ RUN \
 
 # Install uv
 RUN curl -LsSf https://astral.sh/uv/${UV_VERSION}/install.sh | env UV_UNMANAGED_INSTALL="/usr/local/bin" sh
+
+# Install supervisor and patched supervisor-stdout with following fixes:
+# - https://github.com/coderanger/supervisor-stdout/pull/12
+# - https://github.com/coderanger/supervisor-stdout/pull/18
+# - https://github.com/coderanger/supervisor-stdout/pull/20
+RUN export UV_NO_CACHE=1 && \
+    uv venv /opt/supervisor && \
+    source /opt/supervisor/bin/activate && \
+    uv install supervisor https://github.com/nijel/supervisor-stdout/archive/c909c1a1ddabaf679dc2eaecb3b8f5ad6bef467a.zip