Initial try on an action to build RPM packages

.forgejo/workflows/build.yml

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+name: Build docker image
+
+on: [push]
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-22.04
+
+    env:
+      DOCKER_HOST: ${{ vars.DOCKER_HOST  }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build & Publish
+        uses: https://codeberg.org/umglurf/kaniko-action@main
+        with:
+          credentials: |
+            code.r3pek.org=${{ github.repository_owner }}:${{ secrets.PUBLISH_TOKEN }}
+          destinations: |
+            code.r3pek.org/${{ github.repository }}:latest
+          push: true

Dockerfile

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+FROM fedora:41
+
+RUN dnf update -y && dnf upgrade -y; \
+    dnf install -y mock rpmdevtools
+
+COPY entrypoint.sh /
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]
+

action.yml

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+name: "RPM Build"
+description: "Builds RPMs for a target system from a spec file"
+
+inputs:
+  spec:
+    description: "Path to the spec file"
+    required: true
+  system:
+    description: "System target to build the package"
+    required: true
+  arch:
+    description: "Target arch to build the package"
+    required: true
+    default: "x86_64"
+
+outputs:
+  rpm:
+    description: "Path to the generated rpm file"
+
+runs:
+  using: "docker"
+  image: "Dockerfile"
+  args:
+    - ${{ inputs.spec }}
+    - ${{ inputs.system }}
+    - ${{ inputs.arch }}

entrypoint.sh

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+#!/bin/bash
+
+SPEC=$1
+SYSTEM=$2
+ARCH=$3
+
+SPEC_NAME=$(basename ${SPEC})
+CONFIGURATION="${SYSTEM}-${ARCH}"
+
+echo "Building ${SPEC_NAME} for ${CONFIGURATION}"
+
+echo "::group::Building SRPM"
+cd $(dirname ${SPEC})
+
+spectool -g ${SPEC}
+if [ $? -ne 0 ]; then
+  echo "::error Failed to download sources"
+  exit 1
+fi
+
+mock -r "${SYSTEM}-${ARCH}" --buildsrpm --spec ${SPEC_NAME} --sources . --resultdir result
+if [ $? -ne 0 ]; then
+  echo "::error Failed to build SRPM"
+  exit 1
+fi
+echo "::endgroup::"
+
+SRPM=$(grep Wrote result/build.log | cut -d" " -f 2)
+
+echo "::group::Building RPM"
+mock -r "${SYSTEM}-${ARCH}" --resultdir result ${SRPM}
+if [ $? -ne 0 ]; then
+  echo "::error Failed to build RPM"
+  exit 1
+fi
+echo "::endgroup::"
+
+RPM=i$(grep Wrote result/build.log | grep "/RPMS/" | cut -d" " -f 2)
+echo "rpm=${RPM}" >> ${GITHUB_OUTPUT}