Test that toolbox(1) can be built without podman(1) and subordinate IDs

This is meant to roughly replicate the build environments used by
downstream distributors to build toolbox(1).  These can be restricted in
odd ways compared to a fully featured environment where toolbox(1) is
actually going to be used.

It's important to ensure that toolbox(1) can be built by downstream
distributors without any unnecessary hassle.

containers/podman#17657
containers#1246

.zuul.yaml

@@ -37,6 +37,17 @@
     pre-run: playbooks/setup-env-migration-path-for-coreos-toolbox.yaml
     run: playbooks/unit-test.yaml
 
+- job:
+    name: unit-test-restricted
+    description: Run Toolbox's unit tests declared in Meson in a restricted build environment
+    timeout: 1800
+    nodeset:
+      nodes:
+        - name: fedora-rawhide
+          label: cloud-fedora-rawhide
+    pre-run: playbooks/setup-env-restricted.yaml
+    run: playbooks/unit-test.yaml
+
 - job:
     name: system-test-fedora-rawhide
     description: Run Toolbox's system tests in Fedora Rawhide
@@ -80,13 +91,15 @@
       jobs:
         - unit-test
         - unit-test-migration-path-for-coreos-toolbox
+        - unit-test-restricted
         - system-test-fedora-rawhide
         - system-test-fedora-37
         - system-test-fedora-36
     gate:
       jobs:
         - unit-test
         - unit-test-migration-path-for-coreos-toolbox
+        - unit-test-restricted
         - system-test-fedora-rawhide
         - system-test-fedora-37
         - system-test-fedora-36

playbooks/dependencies-fedora-restricted.yaml

@@ -0,0 +1,62 @@
+#
+# Copyright © 2023 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+- name: Remove /etc/subgid
+  become: yes
+  command:
+    cmd: rm /etc/subgid
+    removes: /etc/subgid
+
+- name: Remove /etc/subuid
+  become: yes
+  command:
+    cmd: rm /etc/subuid
+    removes: /etc/subuid
+
+- name: Install RPM packages
+  become: yes
+  package:
+    update_cache: "{{ true if zuul.attempts > 1 else false }}"
+    name:
+      - ShellCheck
+      - bash-completion
+      - codespell
+      - fish
+      - flatpak-session-helper
+      - gcc
+      - golang
+      - golang-github-cpuguy83-md2man
+      - meson
+      - ninja-build
+      - shadow-utils-subid-devel
+      - systemd
+      - udisks2
+
+- name: Download Go modules
+  shell: |
+    go mod download -x
+  args:
+    chdir: '{{ zuul.project.src_dir }}/src'
+
+- name: Set up Git submodules
+  shell: |
+    git submodule init
+    git submodule update
+  args:
+    chdir: '{{ zuul.project.src_dir }}'
+
+- name: Check versions of crucial packages
+  command: rpm -qa ShellCheck codespell *kernel* gcc *glibc* shadow-utils-subid-devel golang flatpak-session-helper

playbooks/setup-env-restricted.yaml

@@ -0,0 +1,25 @@
+#
+# Copyright © 2023 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+---
+- hosts: all
+  tasks:
+    - include_tasks: dependencies-fedora-restricted.yaml
+
+    - name: Set up build directory
+      command: meson setup --fatal-meson-warnings builddir
+      args:
+        chdir: '{{ zuul.project.src_dir }}'