software/theia: set $HOME

When using nested slapos $HOME might not be set (which might be a bug in slapos
format) so set $HOME ourselves so that we don't use home files from the outer
slapos.

software/theia/buildout.hash.cfg

@@ -15,7 +15,7 @@
 
 [instance]
 filename = instance.cfg.in
-md5sum = d6f7d1607641bee3543cebc04db73472
+md5sum = 211601e6fe818ab60c8454549f5fcb71
 
 [yarn.lock]
 filename = yarn.lock

software/theia/instance.cfg.in

@@ -185,7 +185,7 @@ recipe = slapos.cookbook:userinfo
 recipe = slapos.cookbook:wrapper
 wrapper-path = $${directory:services}/$${:_buildout_section_name_}
 command-line =
-  env LC_ALL=C.UTF-8 TMP=$${directory:tmp} THEIA_WEBVIEW_EXTERNAL_ENDPOINT='{{hostname}}' THEIA_SHELL=$${theia-shell:rendered} ${theia-wrapper:rendered} --hostname=$${:hostname} --port=$${:port} $${directory:project}
+  env HOME=$${buildout:directory} LC_ALL=C.UTF-8 TMP=$${directory:tmp} THEIA_WEBVIEW_EXTERNAL_ENDPOINT='{{hostname}}' THEIA_SHELL=$${theia-shell:rendered} ${theia-wrapper:rendered} --hostname=$${:hostname} --port=$${:port} $${directory:project}
 
 ip =  $${instance-parameter:ipv4-random}
 hostname =  $${:ip}