Dockerfile: Migrate to Noble and make it more readable with heredocs, using way less layers and cleaning up apt

Author: C0rn3j

Dockerfile

@@ -1,39 +1,49 @@
 ARG BASE_OS=ubuntu
-ARG BASE_CODENAME=jammy
+ARG BASE_CODENAME=noble
 FROM $BASE_OS:$BASE_CODENAME AS build-stage
 
 # Download build dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-      gcc librsvg2-bin linux-headers-generic python3-dev python3-setuptools
-
+RUN <<EOR
+apt-get update
+apt-get install -y --no-install-recommends \
+	gcc \
+	librsvg2-bin \
+	linux-headers-generic \
+	python3-dev \
+	python3-setuptools \
+	python-is-python3
+apt-get clean && rm -rf /var/lib/apt/lists/*
+EOR
 # Prepare working directory and target
 COPY . /work
 WORKDIR /work
 ARG TARGET=/build/usr
 
 # Build and install
-RUN python3 setup.py build --executable "/usr/bin/env python3" && \
-    python3 setup.py install --single-version-externally-managed --home "${TARGET}" --record /dev/null
+RUN <<EOR
+python setup.py build --executable "/usr/bin/env python3"
+python setup.py install --single-version-externally-managed --home "${TARGET}" --record /dev/null
 
 # Provide input-event-codes.h as fallback for runtime systems without linux headers
-RUN cp -a \
-      "$(find /usr -type f -name input-event-codes.h -print -quit)" \
-      "$(find "${TARGET}" -type f -name uinput.py -printf '%h\n' -quit)"
+cp -a \
+	"$(find /usr -type f -name input-event-codes.h -print -quit)" \
+	"$(find "${TARGET}" -type f -name uinput.py -printf '%h\n' -quit)"
 
 # Create short name symlinks for static libraries
-RUN suffix=".cpython-*-$(uname -m)-linux-gnu.so" && \
-    find "${TARGET}" -type f -path "*/site-packages/*${suffix}" \
-    | while read -r path; do ln -sfr "${path}" "${path%${suffix}}.so"; done
+suffix=".cpython-*-$(uname -m)-linux-gnu.so"
+find "${TARGET}" -type f -path "*/site-packages/*${suffix}" \
+	| while read -r path; do ln -sfr "${path}" "${path%${suffix}}.so"; done
 
 # Put AppStream metadata to required location according to https://wiki.debian.org/AppStream/Guidelines
-RUN metainfo=/build/usr/share/metainfo && \
-    mkdir -p "${metainfo}" && \
-    cp -a scripts/sc-controller.appdata.xml "${metainfo}"
+metainfo=/build/usr/share/metainfo
+mkdir -p "${metainfo}"
+cp -a scripts/sc-controller.appdata.xml "${metainfo}"
 
 # Convert icon to png format (required for icons in .desktop file)
-RUN iconpath="${TARGET}/share/icons/hicolor/512x512/apps" && \
-    mkdir -p "${iconpath}" && \
-    rsvg-convert --background-color none -o "${iconpath}/sc-controller.png" images/sc-controller.svg
+iconpath="${TARGET}/share/icons/hicolor/512x512/apps"
+mkdir -p "${iconpath}"
+rsvg-convert --background-color none -o "${iconpath}/sc-controller.png" images/sc-controller.svg
+EOR
 
 # Store build metadata
 ARG TARGETOS TARGETARCH TARGETVARIANT