fix(docker): start script (#513)

* Denote to the system environment that it is running in docker

* Fix start script to use sh instead of bash and check if in docker

Dockerfile

@@ -22,7 +22,8 @@ ENV USER=container \
 	HOME=/home/container \
 	NODE_ENV=production \
 	HTTP_HOST=0.0.0.0 \
-	HTTP_PORT=80
+	HTTP_PORT=80 \
+	DOCKER=true
 WORKDIR /home/container
 COPY --from=builder --chown=container:container /build /app
 EXPOSE ${HTTP_PORT}/tcp

scripts/start.sh

@@ -1,7 +1,10 @@
-#!/usr/bin/env bash
-
-source="${BASH_SOURCE}"
-base_dir=$(dirname $(dirname "$source"))
+#!/usr/bin/env sh
+if [ "$DOCKER" = "true" ]; then
+    base_dir="/app"
+else
+    source="${BASH_SOURCE}"
+    base_dir=$(dirname $(dirname "$source"))
+fi
 
 echo "Checking environment..."
 script=scripts/preinstall