ci: Sync bootc-ubuntu-setup action from bootc-dev/infra

The CI was failing because we were pulling podman/crun/skopeo
from Debian testing which has become unreliable. The bootc-dev/infra
repository maintains a reusable action that uses Ubuntu's plucky
repository instead, which is more appropriate for ubuntu-24.04 runners.

This also brings in additional improvements from the shared action:
- Disk space cleanup on the runner
- Unprivileged /dev/kvm access setup
- Optional libvirt stack support

Assisted-by: ClaudeCode (Claude Opus 4.5)

.github/actions/bootc-ubuntu-setup/action.yml

@@ -0,0 +1,91 @@
+name: 'Bootc Ubuntu Setup'
+description: 'Default host setup'
+inputs:
+  libvirt:
+    description: 'Install libvirt and virtualization stack'
+    required: false
+    default: 'false'
+runs:
+  using: 'composite'
+  steps:
+    # The default runners have TONS of crud on them...
+    - name: Free up disk space on runner
+      shell: bash
+      run: |
+        set -xeuo pipefail
+        sudo df -h
+        unwanted_pkgs=('^aspnetcore-.*' '^dotnet-.*' '^llvm-.*' 'php.*' '^mongodb-.*' '^mysql-.*'
+                       azure-cli google-chrome-stable firefox mono-devel)
+        unwanted_dirs=(/usr/share/dotnet /opt/ghc /usr/local/lib/android /opt/hostedtoolcache/CodeQL)
+        # Start background removal operations as systemd units; if this causes
+        # races in the future around disk space we can look at waiting for cleanup
+        # before starting further jobs, but right now we spent a lot of time waiting
+        # on the network and scripts and such below, giving these plenty of time to run.
+        n=0
+        runcleanup() {
+          sudo systemd-run -r -u action-cleanup-${n} -- "$@"
+          n=$(($n + 1))
+        }
+        runcleanup docker image prune --all --force
+        for x in ${unwanted_dirs[@]}; do
+          runcleanup rm -rf "$x"
+        done
+        # Apt removals in foreground, as we can't parallelize these
+        for x in ${unwanted_pkgs[@]}; do
+          /bin/time -f '%E %C' sudo apt-get remove -y $x
+        done
+    # We really want support for heredocs
+    - name: Update podman and install just
+      shell: bash
+      run: |
+        set -eux
+        # Require the runner is ubuntu-24.04
+        IDV=$(. /usr/lib/os-release && echo ${ID}-${VERSION_ID})
+        test "${IDV}" = "ubuntu-24.04"
+        # plucky is the next release
+        echo 'deb http://azure.archive.ubuntu.com/ubuntu plucky universe main' | sudo tee /etc/apt/sources.list.d/plucky.list
+        /bin/time -f '%E %C' sudo apt update
+        # skopeo is currently older in plucky for some reason hence --allow-downgrades
+        /bin/time -f '%E %C' sudo apt install -y --allow-downgrades crun/plucky podman/plucky skopeo/plucky just
+    # This is the default on e.g. Fedora derivatives, but not Debian
+    - name: Enable unprivileged /dev/kvm access
+      shell: bash
+      run: |
+        set -xeuo pipefail
+        echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
+        sudo udevadm control --reload-rules
+        sudo udevadm trigger --name-match=kvm
+        ls -l /dev/kvm
+    # Used by a few workflows, but generally useful
+    - name: Set architecture variable
+      id: set_arch
+      shell: bash
+      run: echo "ARCH=$(arch)" >> $GITHUB_ENV
+    # Install libvirt stack if requested
+    - name: Install libvirt and virtualization stack
+      if: ${{ inputs.libvirt == 'true' }}
+      shell: bash
+      run: |
+        set -xeuo pipefail
+        export BCVK_VERSION=0.8.0
+        /bin/time -f '%E %C' sudo apt install -y libkrb5-dev pkg-config libvirt-dev genisoimage qemu-utils qemu-kvm virtiofsd libvirt-daemon-system
+        # Something in the stack is overriding this, but we want session right now for bcvk
+        echo LIBVIRT_DEFAULT_URI=qemu:///session >> $GITHUB_ENV
+        td=$(mktemp -d)
+        cd $td
+        # Install bcvk
+        target=bcvk-$(arch)-unknown-linux-gnu
+        /bin/time -f '%E %C' curl -LO https://github.com/bootc-dev/bcvk/releases/download/v${BCVK_VERSION}/${target}.tar.gz
+        tar xzf ${target}.tar.gz
+        sudo install -T ${target} /usr/bin/bcvk
+        cd -
+        rm -rf "$td"
+
+        # Also bump the default fd limit as a workaround for https://github.com/bootc-dev/bcvk/issues/65
+        sudo sed -i -e 's,^\* hard nofile 65536,* hard nofile 524288,' /etc/security/limits.conf
+    - name: Cleanup status
+      shell: bash
+      run: |
+        set -xeuo pipefail
+        systemctl list-units 'action-cleanup*'
+        df -h

.github/workflows/bootc.yaml

@@ -23,14 +23,7 @@ jobs:
         stream: [stream9, stream10]
     steps:
       - uses: actions/checkout@v4
-      - name: Installdeps
-        run: sudo apt update && sudo apt install just
-      - name: Get a newer podman for heredoc support (from debian testing)
-        run: |
-          set -eux
-          echo 'deb [trusted=yes] https://ftp.debian.org/debian/ testing main' | sudo tee /etc/apt/sources.list.d/testing.list
-          sudo apt update
-          sudo apt install -y crun/testing podman/testing skopeo/testing
+      - uses: ./.github/actions/bootc-ubuntu-setup
       - name: build
         run: sudo STREAM=${{ matrix.stream }} just build
       - name: unitcontainer