Split into base and latest images/workflows

ChangeLog:

	* .github/workflows/build-base.yml: New file.
	* .github/workflows/build-ci-docker.yml: Renamed to build-latest.yml.
	* Dockerfile -> Dockerfile.base.
	* Dockerfile.latest: New file.

Author: mattkretz

.github/workflows/build-ci-docker.yml renamed to .github/workflows/build-base.yml

@@ -2,7 +2,7 @@
 # Copyright © 2025      GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
 #                       Matthias Kretz <m.kretz@gsi.de>
 
-name: Build and Push C++ CI Docker Image
+name: Build Base Image
 
 on:
   workflow_dispatch:  # Allows manual trigger via GitHub UI
@@ -33,6 +33,6 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          file: Dockerfile.base
           push: true
-          tags: ghcr.io/${{ github.actor }}/cplusplus-ci:latest
-
+          tags: ghcr.io/${{ github.repository }}/base

.github/workflows/build-latest.yml

@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+# Copyright © 2025      GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
+#                       Matthias Kretz <m.kretz@gsi.de>
+
+name: Build Latest Image
+
+on:
+  workflow_dispatch:  # Allows manual trigger via GitHub UI
+
+permissions:
+  contents: read
+  packages: write  # Required to push to GHCR
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: Dockerfile.latest
+          push: true
+          tags: ghcr.io/${{ github.repository }}/latest
+

Dockerfile renamed to Dockerfile.base

@@ -36,28 +36,8 @@ RUN dpkg --add-architecture i386 && \
     chmod +x llvm.sh && \
     ./llvm.sh 20 && \
     ./llvm.sh 21 && \
-    rm llvm.sh
-
-# GCC 15
-RUN mkdir -p /root/gcc-15/obj && \
-    cd /root/gcc-15 && \
-    curl -L https://github.com/gcc-mirror/gcc/archive/releases/gcc-15.tar.gz \
-    | tar -xz --strip-components=1 && \
-    cd /root/gcc-15/obj && ../configure --enable-languages=c,c++,lto --prefix=/opt/gcc-15 --disable-checking --disable-bootstrap && \
-    make -j3 && \
-    make -j3 install && \
-    update-alternatives --install /usr/bin/gcc gcc /opt/gcc-15/bin/gcc 150 --slave /usr/bin/g++ g++ /opt/gcc-15/bin/g++ && \
-    cd /root && rm -rf gcc-15
-
-# GCC master
-RUN mkdir -p /root/gcc-master/obj && \
-    cd /root/gcc-master && \
-    curl -L https://github.com/gcc-mirror/gcc/archive/master.tar.gz \
-    | tar -xz --strip-components=1 && \
-    cd /root/gcc-master/obj && ../configure --enable-languages=c,c++,lto --prefix=/opt/gcc-master --disable-checking --disable-bootstrap && \
-    make -j3 && \
-    make -j3 install && \
-    cd /root && rm -rf gcc-master
+    rm llvm.sh && \
+    apt-get clean
 
 CMD ["/bin/bash"]
 

Dockerfile.latest

@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+# Copyright © 2025      GSI Helmholtzzentrum fuer Schwerionenforschung GmbH
+#                       Matthias Kretz <m.kretz@gsi.de>
+
+FROM ghcr.io/mattkretz/cplusplus-ci/base
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# GCC 15
+RUN mkdir -p /root/gcc-15/obj && \
+    cd /root/gcc-15 && \
+    curl -L https://github.com/gcc-mirror/gcc/archive/releases/gcc-15.tar.gz \
+    | tar -xz --strip-components=1 && \
+    cd /root/gcc-15/obj && ../configure --enable-languages=c,c++,lto --prefix=/opt/gcc-15 --disable-checking --disable-bootstrap && \
+    make -j3 && \
+    make -j3 install-strip && \
+    update-alternatives --install /usr/bin/gcc gcc /opt/gcc-15/bin/gcc 150 --slave /usr/bin/g++ g++ /opt/gcc-15/bin/g++ && \
+    cd /root && rm -rf gcc-15
+
+# GCC master
+RUN mkdir -p /root/gcc-master/obj && \
+    cd /root/gcc-master && \
+    curl -L https://github.com/gcc-mirror/gcc/archive/master.tar.gz \
+    | tar -xz --strip-components=1 && \
+    cd /root/gcc-master/obj && ../configure --enable-languages=c,c++,lto --prefix=/opt/gcc-master --disable-checking --disable-bootstrap && \
+    make -j3 && \
+    make -j3 install-strip && \
+    cd /root && rm -rf gcc-master
+
+CMD ["/bin/bash"]
+