ci: Add revdep-ci for bootc

.dockerignore

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+target

.github/workflows/ci-bootc.yml

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+name: revdep CI bootc
+
+permissions:
+  actions: read
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch: {}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  c9s-bootc-e2e:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: build
+        run: sudo podman build -t localhost/test:latest -f ci/Containerfile.c9s-bootc .
+      - name: bootc install
+        run: |
+          set -xeuo pipefail
+          sudo podman run --env BOOTC_SKIP_SELINUX_HOST_CHECK=1 --rm -ti --privileged -v /:/target --pid=host --security-opt label=disable \
+            -v /dev:/dev -v /var/lib/containers:/var/lib/containers \
+            localhost/test:latest bootc install to-filesystem --skip-fetch-check \
+             --replace=alongside /target

ci/Containerfile.c9s-bootc

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+FROM quay.io/centos/centos:stream9 as build
+RUN dnf -y install dnf-utils zstd && dnf config-manager --enable crb && dnf builddep -y composefs && \
+    dnf -y install meson
+COPY . /build
+WORKDIR /build
+RUN set -x; ls -al; meson setup target --prefix=/usr && meson compile -C target && \
+    env DESTDIR=$(pwd)/target/instroot meson install -C target
+
+FROM quay.io/centos-bootc/centos-bootc-dev:stream9
+COPY --from=build /build/target/instroot/usr/ /usr/