Use system uWSGI packages instead of pip installation

Replace pip-installed uWSGI with OS-provided system packages to eliminate
compilation during Docker builds.

Changes:
- Remove uWSGI from requirements.txt
- Debian: Install uwsgi + uwsgi-plugin-python3 from apt
- Alpine: Install uwsgi + uwsgi-python3 from apk
- Remove build dependencies (gcc, build-essential, python3-dev, libffi-dev)
- Remove CPUCOUNT=1 workaround (no longer needed)

Benefits:
- Eliminates uWSGI compilation (major build time improvement)
- Removes need for build toolchain in Docker images
- Smaller build stage (no gcc, build-essential, etc.)
- Faster Docker image builds

Version notes:
- Debian Trixie: uwsgi 2.0.28 (vs pip 2.0.31)
- Alpine 3.22: uwsgi 2.0.30 (vs pip 2.0.31)

System packages are maintained by official distribution teams and receive
security backports within their release cycle.

Author: valentijnscholten

Dockerfile.django-alpine

@@ -11,26 +11,20 @@ WORKDIR /app
 RUN \
   apk update && \
   apk add --no-cache \
-    gcc \
-    build-base \
     bind-tools \
     postgresql16-client \
     xmlsec \
     git \
     util-linux \
     curl-dev \
     openssl \
-    libffi-dev \
-    python3-dev \
     libpq-dev \
     && \
     rm -rf /var/cache/apk/* && \
   true
 COPY requirements.txt ./
-# CPUCOUNT=1 is needed, otherwise the wheel for uwsgi won't always be build succesfully
-# https://github.com/unbit/uwsgi/issues/1318#issuecomment-542238096
 RUN export PYCURL_SSL_LIBRARY=openssl && \
-    CPUCOUNT=1 pip3 wheel --wheel-dir=/tmp/wheels -r ./requirements.txt
+    pip3 wheel --wheel-dir=/tmp/wheels -r ./requirements.txt
 
 FROM base AS release
 WORKDIR /app
@@ -51,6 +45,9 @@ RUN \
     postgresql16-client \
     curl-dev \
     openssl \
+    # uwsgi from system packages (avoids compilation)
+    uwsgi \
+    uwsgi-python3 \
     # needed for integration-tests
     bash \
     && \

Dockerfile.django-debian

@@ -11,8 +11,6 @@ WORKDIR /app
 RUN \
   apt-get -y update && \
   apt-get -y install --no-install-recommends \
-    gcc \
-    build-essential \
     dnsutils \
     libpq-dev \
     postgresql-client \
@@ -26,10 +24,8 @@ RUN \
   rm -rf /var/lib/apt/lists && \
   true
 COPY requirements.txt ./
-# CPUCOUNT=1 is needed, otherwise the wheel for uwsgi won't always be build succesfully
-# https://github.com/unbit/uwsgi/issues/1318#issuecomment-542238096
 RUN export PYCURL_SSL_LIBRARY=openssl && \
-    CPUCOUNT=1 pip3 wheel --wheel-dir=/tmp/wheels -r ./requirements.txt
+    pip3 wheel --wheel-dir=/tmp/wheels -r ./requirements.txt
 
 FROM base AS release
 WORKDIR /app
@@ -55,6 +51,9 @@ RUN \
     postgresql-client \
     # libcurl4-openssl-dev is required for installing pycurl python package
     libcurl4-openssl-dev \
+    # uwsgi from system packages (avoids compilation)
+    uwsgi \
+    uwsgi-plugin-python3 \
     && \
   apt-get clean && \
   rm -rf /var/lib/apt/lists && \

Dockerfile.nginx-alpine

@@ -11,27 +11,21 @@ WORKDIR /app
 RUN \
   apk update && \
   apk add --no-cache \
-    gcc \
-    build-base \
     bind-tools \
     postgresql16-client \
     xmlsec \
     git \
     util-linux \
     curl-dev \
     openssl \
-    libffi-dev \
-    python3-dev \
     libpq-dev \
     && \
     rm -rf /var/cache/apk/* && \
   true
 COPY requirements.txt requirements-dev.txt ./
-# CPUCOUNT=1 is needed, otherwise the wheel for uwsgi won't always be build succesfully
-# https://github.com/unbit/uwsgi/issues/1318#issuecomment-542238096
-RUN CPUCOUNT=1 pip3 wheel --wheel-dir=/tmp/wheels -r ./requirements.txt
+RUN pip3 wheel --wheel-dir=/tmp/wheels -r ./requirements.txt
 # needed for static files debug toolbar
-RUN CPUCOUNT=1 pip3 wheel --wheel-dir=/tmp/wheels -r ./requirements-dev.txt
+RUN pip3 wheel --wheel-dir=/tmp/wheels -r ./requirements-dev.txt
 
 
 FROM build AS collectstatic

requirements.txt

@@ -36,7 +36,8 @@ redis==7.1.0
 requests==2.32.5
 sqlalchemy==2.0.45  # Required by Celery broker transport
 urllib3==2.6.2
-uWSGI==2.0.31
+# uWSGI is installed via system packages (uwsgi + uwsgi-plugin-python3 on Debian,
+# uwsgi + uwsgi-python3 on Alpine) to avoid compilation during Docker builds and to have official binaries
 vobject==0.9.9
 whitenoise==5.2.0
 titlecase==2.4.1