Add dbdefs_to_js helper script to workaround consul-template issue

Since upgrading from consul-template v0.18.5 to v0.25.2 in
b9ff252, the dbdefs_to_js command
string is no longer parsed correctly. The DEBUG log level shows it
getting cut off at the &&. I have no idea why this broke, as I can't
find anything related in the changelog. Moving it to a separate script
dumbs it down enough for the new version.

Author: mwiencek

docker/musicbrainz-website/consul-template-template-renderer.conf

@@ -1,7 +1,7 @@
 template {
     source = "/home/musicbrainz/musicbrainz-server/lib/DBDefs.pm.ctmpl"
     destination = "/home/musicbrainz/musicbrainz-server/lib/DBDefs.pm"
-    command = "sudo -E -H -u musicbrainz sh -c 'cd ~/musicbrainz-server && carton exec -- ./script/dbdefs_to_js.pl'"
+    command = "dbdefs_to_js.sh"
 }
 
 exec {

docker/musicbrainz-website/consul-template-website.conf

@@ -1,7 +1,7 @@
 template {
     source = "/home/musicbrainz/musicbrainz-server/lib/DBDefs.pm.ctmpl"
     destination = "/home/musicbrainz/musicbrainz-server/lib/DBDefs.pm"
-    command = "sudo -E -H -u musicbrainz sh -c 'cd ~/musicbrainz-server && carton exec -- ./script/dbdefs_to_js.pl'"
+    command = "dbdefs_to_js.sh"
 }
 
 exec {

docker/musicbrainz-website/dbdefs_to_js.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+exec sudo -E -H -u musicbrainz sh -c 'cd ~/musicbrainz-server && carton exec -- ./script/dbdefs_to_js.pl'

docker/templates/Dockerfile.website.m4

@@ -30,6 +30,11 @@ RUN chmod 755 \
 COPY \
     docker/scripts/start_musicbrainz_server.sh \
     docker/scripts/start_template_renderer.sh \
+    docker/musicbrainz-website/dbdefs_to_js.sh \
     /usr/local/bin/
+RUN chmod 755 \
+        /usr/local/bin/start_musicbrainz_server.sh \
+        /usr/local/bin/start_template_renderer.sh \
+        /usr/local/bin/dbdefs_to_js.sh
 
 copy_mb(`docker/templates/DBDefs.pm.ctmpl lib/')