Make recent `makecontainerpkg` changes work with Docker

devel/container/base-devel/Dockerfile

@@ -2,7 +2,8 @@ FROM archlinux:base as base
 MAINTAINER Martchus <martchus@gmx.net>
 
 RUN mkdir -p /startdir /build && \
-    useradd -m -d /build -u 1000 -U -s /bin/bash builduser && \
+    groupadd -g 1000 builduser && \
+    useradd -m -d /build -u 1000 -g 1000 -s /bin/bash builduser && \
     chown -R builduser:builduser /startdir /build && \
     echo 'builduser ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers && \
     pacman-key --init && \

devel/container/makecontainerpkg

@@ -19,7 +19,19 @@ else
     uuid=$(cat /proc/sys/kernel/random/uuid)
     name=$tool-$pkgname-$uuid
 fi
-cre_args=(--name "$name" --workdir "/startdir" -v "$PWD":/startdir -it --userns=keep-id:uid=1000,gid=1000)
+cre_args=(--name "$name" --workdir "/startdir" -v "$PWD":/startdir -it)
+cre_rm_args=(--force)
+
+# use "builduser" that has been created via the Dockerfile
+uid=1000 gid=1000
+if [[ $CRE == 'podman' ]]; then
+    cre_args+=(--userns="keep-id:uid=$uid,gid=$gid")
+    cre_rm_args+=(--time 0)
+else
+    cre_args+=(--user="$uid:$gid")
+    # caveat: In contrast to Podman this gives a wrong gid for newly created files by
+    #         default. Maybe it would help to pass `--userns-remap=…` to `dockerd`.
+fi
 
 # parse arguments
 script_args= read_script_args=
@@ -77,7 +89,7 @@ fi
 
 # stop and remove container unless we want to keep it for debugging
 [[ $ec == 0 && $DEBUG == on-failure || -z $DEBUG ]] && \
-    "$cre" container rm --force --time 0 "$name"
+    "$cre" container rm "${cre_rm_args[@]}" "$name"
 
 # log message about commands to use for investigation
 [[ $ec != 0 ]] && [[ $DEBUG ]] && echo \