Make the default PID file compile-time settable (#12485)

#12391 offered to change the default PID file from /var/run/gitea.pid however in discussion it was decided that this could break users of older systems. An alternative was offered that we could make the PID file compile/link time settable.

This PR does this, and changes the name of the setting from CustomPID to simply PIDFile. It also updates the from-source docs to show how to change the compiler settings to do this.

Closes #12391

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Florian Klink <flokli@flokli.de>

contrib/init/debian/gitea

@@ -18,7 +18,7 @@ PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin
 DESC="Gitea - Git with a cup of tea"
 NAME=gitea
 SERVICEVERBOSE=yes
-PIDFILE=/var/run/$NAME.pid
+PIDFILE=/run/$NAME.pid
 SCRIPTNAME=/etc/init.d/$NAME
 WORKINGDIR=/var/lib/$NAME
 DAEMON=/usr/local/bin/$NAME

contrib/init/gentoo/gitea

@@ -7,7 +7,7 @@ start_stop_daemon_args="--user ${USER} --chdir ${DIR}"
 command="/usr/local/bin/gitea"
 command_args="web -c /etc/gitea/app.ini"
 command_background=yes
-pidfile=/var/run/gitea.pid
+pidfile=/run/gitea.pid
 
 depend()
 {

contrib/init/suse/gitea

@@ -93,7 +93,7 @@ case "$1" in
 
 		# Return value is slightly different for the status command:
 		# 0 - service up and running
-		# 1 - service dead, but /var/run/  pid  file exists
+		# 1 - service dead, but /run/  pid  file exists
 		# 2 - service dead, but /var/lock/ lock file exists
 		# 3 - service not running (unused)
 		# 4 - service status unknown :-(