feat: inject the dokku PID into temporary files/directories

This will allow background processes to cleanup these files if they were unable to be cleaned up during a run of the dokku binary, as is the case for files copied by the docker binary when running in docker.

plugins/ssh-keys/functions

@@ -15,7 +15,7 @@ verify_ssh_key_file() {
   [[ -s ${DOKKU_ROOT}/.ssh/authorized_keys ]] || dokku_log_fail "No public keys found."
   local key line=0
   local TMP_KEY_FILE
-  TMP_KEY_FILE=$(mktemp "/tmp/dokku-${FUNCNAME[0]}.XXXX")
+  TMP_KEY_FILE=$(mktemp "/tmp/dokku-${DOKKU_PID}-${FUNCNAME[0]}.XXXX")
   trap "rm -rf '$TMP_KEY_FILE' >/dev/null" RETURN INT TERM EXIT
 
   while read -r key; do

plugins/ssh-keys/subcommands/add

@@ -10,7 +10,7 @@ add_keys() {
   [[ "$1" == "$cmd" ]] && shift 1
   declare NAME="$1" KEY_FILE="$2"
   local TMP_KEY_FILE
-  TMP_KEY_FILE=$(mktemp "/tmp/dokku-${FUNCNAME[0]}.XXXX")
+  TMP_KEY_FILE=$(mktemp "/tmp/dokku-${DOKKU_PID}-${FUNCNAME[0]}.XXXX")
   trap "rm -rf '$TMP_KEY_FILE' >/dev/null" RETURN INT TERM EXIT
 
   if [[ -n "$KEY_FILE" ]]; then