add fedora 42 to CI

.github/workflows/fedora.yml

@@ -25,6 +25,8 @@ jobs:
             CMAKE_PREFIX_PATH: '/usr/lib64/cmake/Qt6'
           - IMAGE: '41'
             CMAKE_PREFIX_PATH: '/usr/lib64/cmake/Qt6'
+          - IMAGE: '42'
+            CMAKE_PREFIX_PATH: '/usr/lib64/cmake/Qt6'
     container:
       image: gpsbabel-docker.jfrog.io/tsteven4/gpsbabel_build_environment_f${{ matrix.IMAGE }}
       env:

tools/Dockerfile_f42

@@ -0,0 +1,30 @@
+# this file is used to build the image gpsbabel_build_environment used by github actions.
+
+FROM fedora:42
+
+LABEL maintainer="https://github.com/tsteven4"
+
+WORKDIR /app
+
+# basic tools to build
+RUN dnf install --assumeyes git make valgrind diffutils findutils langpacks-en ninja-build gawk && \
+    dnf clean all
+# libraries used by gpsbabel.  zlib and shapelib may or may not be used depending qmake options.
+RUN dnf install --assumeyes libusb1-devel zlib-devel shapelib-devel && \
+    dnf clean all
+# Qt used by gpsbabel, gpsbabelfe
+RUN dnf install --assumeyes qt6-qtbase-devel qt6-qtserialport-devel qt6-qtwebengine-devel qt6-linguist qt6-qttranslations qt6-qt5compat-devel qt6-qttools-devel libxkbcommon-devel && \
+    dnf clean all
+# tools to build the docs
+RUN dnf install --assumeyes expat desktop-file-utils libxslt docbook-style-xsl fop docbook5-style-xsl docbook5-schemas && \
+    dnf clean all
+# debuginfo for valgrind suppressions (or use DEBUGINFOD server)
+RUN dnf install --assumeyes 'dnf-command(debuginfo-install)' && \
+    dnf debuginfo-install --assumeyes qt6-qtbase && \
+    dnf clean all
+# alternate compiler
+RUN dnf install --assumeyes clang && \
+    dnf clean all
+# tools for build_extra_tests.sh
+RUN dnf install --assumeyes libasan libubsan clazy && \
+    dnf clean all