Podman image: Mass cleanup + fix missing storage.conf

As of Fedora 36, `/etc/containers/storage.conf` with defaults is
installed under `/usr/share/containers/`.  This was causing builds
to fail in the necessary `sed` command that enables fuse-overlayfs.
Fix this by using sed on the new location with an output redirect
into the `etc` location.

Also, perform a mass-cleanup of the three files to make them easier
to read/maintain.  Including renaming them to `Containerfile`,
since all native build tooling is now used to produce them.

Lastly, take advantage of the `podman-next` copr repository to install
the latest/greatest podman from `main`, rather than building it from
scratch.  This will greatly speed up the image build speed.

Signed-off-by: Chris Evich <cevich@redhat.com>

contrib/podmanimage/stable/Containerfile

@@ -0,0 +1,56 @@
+# stable/Containerfile
+#
+# Build a Podman container image from the latest
+# stable version of Podman on the Fedoras Updates System.
+# https://bodhi.fedoraproject.org/updates/?search=podman
+# This image can be used to create a secured container
+# that runs safely with privileges within the container.
+#
+FROM registry.fedoraproject.org/fedora:latest
+
+# Don't include container-selinux and remove
+# directories used by dnf that are just taking
+# up space.
+RUN dnf -y update && \
+    rpm --setcaps shadow-utils 2>/dev/null && \
+    dnf -y install podman fuse-overlayfs \
+        --exclude container-selinux && \
+    dnf clean all && \
+    rm -rf /var/cache /var/log/dnf* /var/log/yum.*
+
+RUN useradd podman; \
+echo -e "podman:1:999\npodman:1001:64535" > /etc/subuid; \
+echo -e "podman:1:999\npodman:1001:64535" > /etc/subgid;
+
+ARG _REPO_URL="https://raw.githubusercontent.com/containers/podman/main/contrib/podmanimage/stable"
+ADD $_REPO_URL/storage.conf /etc/containers/storage.conf
+ADD $_REPO_URL/containers.conf /etc/containers/containers.conf
+ADD $_REPO_URL/podman-containers.conf /home/podman/.config/containers/containers.conf
+
+RUN mkdir -p /home/podman/.local/share/containers && \
+    chown podman:podman -R /home/podman && \
+    chmod 644 /etc/containers/containers.conf
+
+# Copy & modify the defaults to provide reference if runtime changes needed.
+# Changes here are required for running with fuse-overlay storage inside container.
+RUN sed -i -e 's|^#mount_program|mount_program|g' \
+           -e '/additionalimage.*/a "/var/lib/shared",' \
+           -e 's|^mountopt[[:space:]]*=.*$|mountopt = "nodev,fsync=0"|g' \
+           /usr/share/containers/storage.conf \
+           > /etc/containers/storage.conf
+
+# Note VOLUME options must always happen after the chown call above
+# RUN commands can not modify existing volumes
+VOLUME /var/lib/containers
+VOLUME /home/podman/.local/share/containers
+
+RUN mkdir -p /var/lib/shared/overlay-images \
+             /var/lib/shared/overlay-layers \
+             /var/lib/shared/vfs-images \
+             /var/lib/shared/vfs-layers && \
+    touch /var/lib/shared/overlay-images/images.lock && \
+    touch /var/lib/shared/overlay-layers/layers.lock && \
+    touch /var/lib/shared/vfs-images/images.lock && \
+    touch /var/lib/shared/vfs-layers/layers.lock
+
+ENV _CONTAINERS_USERNS_CONFIGURED=""

contrib/podmanimage/stable/Dockerfile

@@ -1,36 +0,0 @@
-# stable/Dockerfile
-#
-# Build a Podman container image from the latest
-# stable version of Podman on the Fedoras Updates System.
-# https://bodhi.fedoraproject.org/updates/?search=podman
-# This image can be used to create a secured container
-# that runs safely with privileges within the container.
-#
-FROM registry.fedoraproject.org/fedora:latest
-
-# Don't include container-selinux and remove
-# directories used by yum that are just taking
-# up space.
-RUN dnf -y update; rpm --restore shadow-utils 2>/dev/null; \
-yum -y install podman fuse-overlayfs --exclude container-selinux; \
-rm -rf /var/cache /var/log/dnf* /var/log/yum.*
-
-RUN useradd podman; \
-echo -e "podman:1:999\npodman:1001:64535" > /etc/subuid; \
-echo -e "podman:1:999\npodman:1001:64535" > /etc/subgid;
-
-ADD https://raw.githubusercontent.com/containers/podman/main/contrib/podmanimage/stable/containers.conf /etc/containers/containers.conf
-ADD https://raw.githubusercontent.com/containers/podman/main/contrib/podmanimage/stable/podman-containers.conf /home/podman/.config/containers/containers.conf
-
-RUN mkdir -p /home/podman/.local/share/containers; chown podman:podman -R /home/podman
-
-# Note VOLUME options must always happen after the chown call above
-# RUN commands can not modify existing volumes
-VOLUME /var/lib/containers
-VOLUME /home/podman/.local/share/containers
-
-# chmod containers.conf and adjust storage.conf to enable Fuse storage.
-RUN chmod 644 /etc/containers/containers.conf; sed -i -e 's|^#mount_program|mount_program|g' -e '/additionalimage.*/a "/var/lib/shared",' -e 's|^mountopt[[:space:]]*=.*$|mountopt = "nodev,fsync=0"|g' /etc/containers/storage.conf
-RUN mkdir -p /var/lib/shared/overlay-images /var/lib/shared/overlay-layers /var/lib/shared/vfs-images /var/lib/shared/vfs-layers; touch /var/lib/shared/overlay-images/images.lock; touch /var/lib/shared/overlay-layers/layers.lock; touch /var/lib/shared/vfs-images/images.lock; touch /var/lib/shared/vfs-layers/layers.lock
-
-ENV _CONTAINERS_USERNS_CONFIGURED=""

contrib/podmanimage/stable/storage.conf

@@ -0,0 +1,6 @@
+[storage.options]
+additionalimagestores = ["/var/lib/shared"]
+
+[storage.options.overlay]
+mountopt = "nodev,fsync=0"
+mount_program = "/usr/bin/fuse-overlayfs"