Fix script execution when bash is not available

For runtimes where bash is not available put-ld-config-path and
symlink-alternatives fail with error:
put-ldconfig-in-path | sh: 1: /tmp/script/put-ldconfig-in-path: not found

Running those script from outside of chroot fixes it.
Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>

flatdeb/debos-runtimes.yaml

@@ -229,8 +229,8 @@ actions:
 
   - action: run
     label: put-ldconfig-in-path
-    chroot: true
-    script: put-ldconfig-in-path
+    chroot: false
+    command: 'echo; "$RECIPEDIR/put-ldconfig-in-path" "$ROOTDIR"'
 
   - action: run
     label: clean-up-before-pack
@@ -279,8 +279,8 @@ actions:
 
   - action: run
     label: symlink-alternatives
-    chroot: true
-    script: symlink-alternatives
+    chroot: false
+    command: 'echo; "$RECIPEDIR/symlink-alternatives" "$ROOTDIR"'
 
   {{ if $debug_symbols }}
   - action: run

flatdeb/put-ldconfig-in-path

@@ -30,16 +30,24 @@ set -o pipefail
 
 me="$(basename "$0")"
 
-if [ "$#" != 0 ] || [ "x$(id -u)" != x0 ]; then
+if [ "$#" != 1 ] || [ "$1" = '--help' ] || [ "x$(id -u)" != x0 ] ||
+        ! [ -d "$1" ]; then
     echo "$me: Usage:" >&2
-    echo "    $me" >&2
+    echo "    $me SYSROOT" >&2
     echo "" >&2
-    echo "Run this script as root, in the container." >&2
+    echo "Run this script as root." >&2
     exit 2
 fi
 
 set -x
 
-if ! test -e /bin/ldconfig; then
-    ln -s /sbin/ldconfig /bin/ldconfig
+sysroot="$1"
+cd "$sysroot"
+
+in_chroot () {
+    chroot "$sysroot" "$@"
+}
+
+if ! test -e $sysroot/bin/ldconfig; then
+    in_chroot ln -s /sbin/ldconfig /bin/ldconfig
 fi

flatdeb/symlink-alternatives

@@ -30,15 +30,23 @@ set -o pipefail
 
 me="$(basename "$0")"
 
-if [ "$#" != 0 ] || [ "x$(id -u)" != x0 ]; then
+if [ "$#" != 1 ] || [ "$1" = '--help' ] || [ "x$(id -u)" != x0 ] ||
+        ! [ -d "$1" ]; then
     echo "$me: Usage:" >&2
-    echo "    $me" >&2
+    echo "    $me SYSROOT" >&2
     echo "" >&2
-    echo "Run this script as root, in the container." >&2
+    echo "Run this script as root." >&2
     exit 2
 fi
 
-find / -xdev '(' \
+sysroot="$1"
+cd "$sysroot"
+
+in_chroot () {
+    chroot "$sysroot" "$@"
+}
+
+in_chroot find / -xdev '(' \
     -lname '/etc/alternatives/*' -o \
     -lname '/etc/locale.alias' \
 ')' -exec sh -euc '