Add quay.io action

Provides the images fedora-dnf5 and fedora-dnf5-nightly which come with
DNF5 pre-installed

Provides:
- fedora-dnf5:
    Fedora with DNF5 installed from repos
- fedora-dnf5-nightly
    Fedora with DNF5 installed from COPR rpmsoftwaremanagement/dnf-nightly
- fedora-dnf5-testing
    Fedora with DNF5 installed and DNF obsoleted i.e. with DNF5 installed
    from COPR rpmsoftwaremanagement/dnf5-testing
- fedora-dnf5-testing-nightly
    Fedora with DNF5 nightly installed and DNF obsoleted i.e. with DNF5
    installed from COPR rpmsoftwaremanagement/dnf5-testing-nightly

All images are built following fedora tags 38, 39, 40, stable, latest
and rawhide

.github/workflows/container-build-quay-io.yml

@@ -0,0 +1,58 @@
+---
+name: Build DNF5 containers on quay.io
+on:
+  schedule:
+    - cron: '0 4 * * *' # at 4am UTC, 2 hours after nightlies are built
+  workflow_dispatch:
+
+
+# from https://github.com/marketplace/actions/push-to-registry
+jobs:
+  build:
+    name: Build and push image
+    strategy:
+      fail_fast: false
+      matrix:
+        name:
+          - dnf5
+          - dnf5-nightly
+          - dnf5-testing
+          - dnf5-testing-nightly
+        tag:
+          - 38
+          - 39
+          - stable
+          - latest
+          - rawhide
+
+    runs_on: ubuntu:20.04
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Build Image
+      id: build-image
+      uses: redhat-actions/buildah-build@v2
+      with:
+        image: rpmsoftwaremanagement/fedora-${{ matrix.name }}
+        tags: ${{ matrix.tag }}
+        containerfiles: |
+          .containerfiles/Containerfile
+        build_args:
+          TAG=${{ matrix.tag }}
+          NAME=${{ matrix.name }}
+
+    # Podman Login action (https://github.com/redhat-actions/podman-login) also be used to log in,
+    # in which case 'username' and 'password' can be omitted.
+    - name: Push To quay.io
+      id: push-to-quay
+      uses: redhat-actions/push-to-registry@v2
+      with:
+        image: ${{ steps.build-image.outputs.image }}
+        tags: ${{ steps.build-image.outputs.tags }}
+        registry: quay.io/rpmsoftwaremanagement
+        username: ${{ secrets.QUAY_IO_REGISTRY_USERNAME }}
+        password: ${{ secrets.QUAY_IO_REGISTRY_PASSWORD }}
+
+    - name: Print image url
+      run: echo "Image pushed to ${{ steps.push-to-quay.outputs.registry-paths }}"

containerfiles/Containerfile

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+FROM fedora:$TAG
+
+ARG TAG
+ARG NAME
+
+RUN dnf -y update \
+    && dnf -y install 'dnf-command(copr)' \
+
+    # enable nightly repositories
+    && if [ "$NAME" == "dnf5-nightly" ]; then \
+        dnf copr -y enable rpmsoftwaremanagement/dnf-nightly ; \
+    fi \
+
+    # enable testing repositories
+    && if [ "$NAME" == "dnf5-testing" ] || [ "$NAME" == "dnf5-testing-nightly" ]; then \
+        dnf copr -y enable rpmsoftwaremanagement/"$NAME" ; \
+    fi \
+
+    # install all the DNF5 stack
+    && dnf -y install dnf5 dnf-data dnf5-plugins \
+
+    # clean installed packages
+    # from this on we need to be careful to specify which dnf to use
+    && dnf4 -y remove 'dnf-command(copr)' \
+    && dnf4 clean all \
+    && dnf5 clean all