[Docker] Reformat and posixify startup script

docker-startup.sh

-#!/bin/bash
+#!/bin/sh
 
 RUN_MODE=${RUN_MODE:-uwsgi}
 HTTP_PORT=${HTTP_PORT:-8000}
 PREPARE=${PREPARE:-1}
 
 wait_migrations() {
-    echo -n "Waiting for migrations to appear"
-    while ! aleksis-admin migrate --check >/dev/null 2>&1; do
-	sleep 0.5
-	echo -n .
-    done
-    echo
+	echo -n "Waiting for migrations to appear"
+	until aleksis-admin migrate --check >/dev/null 2>&1; do
+		sleep 0.5
+		echo -n .
+	done
+	echo
 }
 
 wait_database() {
-    echo -n "Waiting for database."
-    while ! aleksis-admin dbshell -- -c "SELECT 1" >/dev/null 2>&1; do
-	sleep 0.5
-	echo -n .
-    done
-    echo
+	echo -n "Waiting for database."
+	until aleksis-admin dbshell -- -c "SELECT 1" >/dev/null 2>&1; do
+		sleep 0.5
+		echo -n .
+	done
+	echo
 }
 
 prepare_static() {
-    aleksis-admin compilescss
-    aleksis-admin collectstatic --no-input --clear
+	aleksis-admin compilescss
+	aleksis-admin collectstatic --no-input --clear
 }
 
 prepare_database() {
-    aleksis-admin migrate
-    aleksis-admin createinitialrevisions
+	aleksis-admin migrate
+	aleksis-admin createinitialrevisions
 }
 
-
-if [[ -z $ALEKSIS_secret_key ]]; then
-    if [[ ! -e /var/lib/aleksis/secret_key ]]; then
-	touch /var/lib/aleksis/secret_key; chmod 600 /var/lib/aleksis/secret_key
-	LC_ALL=C tr -dc 'A-Za-z0-9!"#$%&'\''()*+,-./:;<=>?@[\]^_`{|}~' </dev/urandom | head -c 64 >/var/lib/aleksis/secret_key
-    fi
-    ALEKSIS_secret_key=$(</var/lib/aleksis/secret_key)
+if [ -z "$ALEKSIS_secret_key" ]; then
+	if [ ! -e /var/lib/aleksis/secret_key ]; then
+		touch /var/lib/aleksis/secret_key
+		chmod 600 /var/lib/aleksis/secret_key
+		LC_ALL=C tr -dc 'A-Za-z0-9!"#$%&'\''()*+,-./:;<=>?@[\]^_`{|}~' </dev/urandom | head -c 64 >/var/lib/aleksis/secret_key
+	fi
+	ALEKSIS_secret_key=$(cat /var/lib/aleksis/secret_key)
 fi
 
 wait_database
 
 case "$RUN_MODE" in
-    uwsgi)
-	if [[ $PREPARE = 1 ]]; then
-	    prepare_database
-	    prepare_static
+uwsgi)
+	if [ $PREPARE = 1 ]; then
+		prepare_database
+		prepare_static
 	else
-	    wait_migrations
+		wait_migrations
 	fi
 
 	exec aleksis-admin runuwsgi -- --http-socket=:$HTTP_PORT
-        ;;
-    celery-*)
-    	if [[ $PREPARE = 1 ]]; then
-	    prepare_database
+	;;
+celery-*)
+	if [ $PREPARE = 1 ]; then
+		prepare_database
 	else
-	    wait_migrations
+		wait_migrations
 	fi
 
 	exec celery -A aleksis.core ${RUN_MODE#celery-}
 	;;
-    prepare)
+prepare)
 	prepare_database
 	prepare_static
 	;;
-    *)
+*)
 	exec "$@"
 	;;
 esac