Use shell-exec to run buildah

.gitlab-ci.yml

@@ -4,14 +4,12 @@ stages:
 fedora-build-job:
   stage: build
   tags:
-    - podman-exec
-  image: git.hyperreal.coffee:5050/fedora-atomic/containers/buildah:latest
+    - shell-exec
   variables:
-    STORAGE_DRIVER: vfs
-    BUILDAH_FORMAT: docker
-    BUILDAH_ISOLATION: chroot
     FQ_IMAGE_NAME: "$CI_REGISTRY_IMAGE/fedora:latest"
   before_script:
+    - buildah rm --all
+    - buildah prune -af
     - buildah login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" "$CI_REGISTRY"
   script:
     - container=$(buildah from registry.fedoraproject.org/fedora:latest)
@@ -25,14 +23,13 @@ fedora-build-job:
 fedora-distrobox-build-job:
   stage: build
   tags:
-    - podman-exec
-  image: git.hyperreal.coffee:5050/fedora-atomic/containers/buildah:latest
+    - shell-exec
   variables:
-    STORAGE_DRIVER: vfs
     BUILDAH_FORMAT: docker
-    BUILDAH_ISOLATION: chroot
     FQ_IMAGE_NAME: "$CI_REGISTRY_IMAGE/fedora-distrobox:39"
   before_script:
+    - buildah rm --all
+    - buildah prune -af
     - buildah login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" "$CI_REGISTRY"
   script:
     - container=$(buildah from registry.fedoraproject.org/fedora-toolbox:39)

buildah/Containerfile

@@ -1,17 +0,0 @@
-FROM    quay.io/buildah/stable:v1.34.0
-
-RUN     touch /etc/subgid /etc/subuid \
-        && chmod g=u /etc/subgid /etc/subuid /etc/passwd \
-        && echo build:10000:65536 > /etc/subuid \
-        && echo build:10000:65536 > /etc/subgid
-
-# Use chroot since the default runc doesn't work when running rootless
-RUN     echo "export BUILDAH_ISOLATION=chroot" >> /home/build/.bashrc
-
-# Use VFS since fuse does not work
-RUN     mkdir -p /home/build/.config/containers \
-        && (echo '[storage]';echo 'drive = "vfs"') > /home/build/.config/containers/storage.conf
-
-# The buildah container will run as build user
-USER    build
-WORKDIR /home/build