btop, tilde: Change file ownership with Docker (#188)

Originally only tested with Podman it was of course writing files as
root with Docker which couldn't then be moved/deleted. Add a check for
Docker vs Podman to do a chown in the container as last step when
needed.


## How to use


## Testing done

Tested on Flatcar with Docker and on Fedora with Podman

Author: pothos

btop.sysext/create.sh

@@ -21,6 +21,7 @@ function populate_sysext_root() {
   local img_arch="$(arch_transform 'x86-64' 'amd64' "$arch")"
   img_arch="$(arch_transform 'arm64' 'arm64/v8' "$img_arch")"
 
+  local sysextname=btop
   docker run --rm \
               -i \
               -v "${scriptroot}/tools/":/tools \
@@ -29,7 +30,7 @@ function populate_sysext_root() {
               --pull always \
               --network host \
               docker.io/alpine:latest \
-                  sh -c "apk add -U btop bash coreutils grep && cd /install_root && ETCMAP=chroot /tools/flatwrap.sh / btop /usr/bin/btop"
+                  sh -c "apk add -U btop bash coreutils grep && cd /install_root && ETCMAP=chroot /tools/flatwrap.sh / $sysextname /usr/bin/btop && OWNER=\$(stat -c '%u:%g' /install_root) && if [ \"\$OWNER\" != \"\$(id -u):\$(id -g)\" ]; then chown -R \"\$OWNER\" /install_root/$sysextname; fi"
   # Alpine has /etc/terminfo instead of /usr/terminfo,
   # so above we need to skip mapping the host /etc into the flatwrap env
   mv "${sysextroot}"/btop/usr "${sysextroot}"/usr

tilde.sysext/create.sh

@@ -25,6 +25,7 @@ function populate_sysext_root() {
   lib_arch="$(arch_transform 'x86-64' 'x86_64' "$lib_arch")"
   lib_arch="$(arch_transform 'arm64' 'aarch64' "$lib_arch")"
 
+  local sysextname=tilde
   docker run --rm \
               -i \
               -v "${scriptroot}/tools/":/tools \
@@ -33,7 +34,7 @@ function populate_sysext_root() {
               --pull always \
               --network host \
               docker.io/debian:bookworm-slim \
-                  sh -c "apt update && apt install -y tilde patchelf && cd /install_root && /tools/flix.sh / tilde /usr/bin/tilde /usr/lib/${lib_arch}-linux-gnu/transcript1 /usr/lib/${lib_arch}-linux-gnu/libt3widget"
+                  sh -c "apt update && apt install -y tilde patchelf && cd /install_root && /tools/flix.sh / $sysextname /usr/bin/tilde /usr/lib/${lib_arch}-linux-gnu/transcript1 /usr/lib/${lib_arch}-linux-gnu/libt3widget && OWNER=\$(stat -c '%u:%g' /install_root) && if [ \"\$OWNER\" != \"\$(id -u):\$(id -g)\" ]; then chown -R \"\$OWNER\" /install_root/$sysextname; fi"
   # We ship /usr/lib/...-linux-gnu/{transcript1,libt3widget} host folders.
   # But we assume that the host has /usr/share/terminfo around
   # otherwise we would need to add it as last argument above.