Resolve shellcheck warnings in container-script

This fixes a couple of small potential issues pointed out by shellcheck.

Signed-off-by: Anton Lundin <[email protected]>

script/run/run.sh

@@ -36,7 +36,7 @@ if [ "$(pwd)" != '/' ]; then
 fi
 if [ -n "$COMPOSE_FILE" ]; then
     COMPOSE_OPTIONS="$COMPOSE_OPTIONS -e COMPOSE_FILE=$COMPOSE_FILE"
-    compose_dir=$(realpath $(dirname $COMPOSE_FILE))
+    compose_dir=$(realpath "$(dirname "$COMPOSE_FILE")")
 fi
 # TODO: also check --file argument
 if [ -n "$compose_dir" ]; then
@@ -47,7 +47,7 @@ if [ -n "$HOME" ]; then
 fi
 
 # Only allocate tty if we detect one
-if [ -t 0 -a -t 1 ]; then
+if [ -t 0 ] && [ -t 1 ]; then
     DOCKER_RUN_OPTIONS="$DOCKER_RUN_OPTIONS -t"
 fi
 
@@ -56,8 +56,9 @@ DOCKER_RUN_OPTIONS="$DOCKER_RUN_OPTIONS -i"
 
 
 # Handle userns security
-if [ ! -z "$(docker info 2>/dev/null | grep userns)" ]; then
+if docker info 2>/dev/null | grep -q userns; then
     DOCKER_RUN_OPTIONS="$DOCKER_RUN_OPTIONS --userns=host"
 fi
 
+# shellcheck disable=SC2086
 exec docker run --rm $DOCKER_RUN_OPTIONS $DOCKER_ADDR $COMPOSE_OPTIONS $VOLUMES -w "$(pwd)" $IMAGE "$@"