Add doxygen 1.13.2 container

ChangeLog:

	* .github/workflows/build-base.yml: Add doxygen.
	* Dockerfile.doxygen: New file.

Author: mattkretz

.github/workflows/build-base.yml

@@ -44,7 +44,7 @@ jobs:
 
     strategy:
       matrix:
-        image: [clang14, clang15, clang16, clang17, clang18, gcc9, gcc10, gcc11, gcc12, gcc13, gcc14]
+        image: [clang14, clang15, clang16, clang17, clang18, gcc9, gcc10, gcc11, gcc12, gcc13, gcc14, doxygen]
 
     runs-on: ubuntu-latest
 

Dockerfile.doxygen

@@ -0,0 +1,12 @@
+# 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/common
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN mkdir -p /opt/doxygen/tmp && cd /opt/doxygen/tmp && \
+    curl -L https://www.doxygen.nl/files/doxygen-1.13.2.linux.bin.tar.gz | tar -xz --strip-components=1 && \
+    mv bin/* ../ && cd .. && rm -rf tmp && \
+    update-alternatives --install /usr/bin/doxygen doxygen /opt/doxygen/doxygen 1132 --slave /usr/bin/doxyindexer doxyindexer /opt/doxygen/doxyindexer