initial attempt

.gitea/workflows/build_push.yml

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+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest-intranet
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Login to Docker Registry
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.psi.ch
+          username: detectors-gitea
+          password: ${{ secrets.SERVICE }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: gitea.psi.ch/${{ github.repository }}:latest

Dockerfile

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+FROM gitea.psi.ch/images/rhel8-developer-gitea-actions
+
+RUN dnf -y install cmake
+RUN dnf -y install python3.12  
+RUN dnf -y install python3.12-devel
+RUN dnf -y install python3.12-pip
+
+COPY files/rpmmacros /root/.rpmmacros

Readme.md

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+# Overview
+This is the PSI rhel8 docker developer image. It contains most developer tools especially for building rpms, etc.
+
+
+# Usage
+
+The image can be used as follows:
+
+```bash
+docker run -it --rm gitea.psi.ch/detectors-int/rhel8-detectors-dev
+```
+
+To build an RPM this image can be used as follows:
+```bash
+docker run --platform linux/amd64 -it --rm -v $(pwd):/data --workdir /data  gitea.psi.ch/images/rhel8-developer-github-actions rpmbuild -ba whatever.spec
+```
+
+
+To base other images upon this image use
+```dockerfile
+FROM detectors-int/rhel8-detectors-dev
+```
+in your Dockerfile
+
+# Build
+
+To build the image use:
+```bash
+docker build --platform linux/x86_64 -t gitea.psi.ch/detectors-int/rhel8-detectors-dev .
+```
+
+To push the image to the central container registry do:
+```bash
+docker login gitea.psi.ch
+docker push gitea.psi.ch/detectors-int/rhel8-detectors-dev
+```

files/rpmmacros

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+%_topdir            %{getenv:PWD}
+%_builddir          %{_topdir}/BUILD
+%_buildrootdir      %{_topdir}/BUILDROOT
+%_rpmdir            %{_topdir}/RPMS
+%_sourcedir         %{_topdir}/SOURCES
+%_specdir           %{_topdir}/SPECS
+%_srcrpmdir         %{_topdir}/SRPMS
+%packager           Docker RPM Build Image