tests: run mvdan/shfmt on test runs

While I do not agree with _every_ style change, this will force Dokku to have consistent formatting across all shell scripts, which is arguably a Good Thing™.

The command used to reprocess everything is:

```shell
shfmt -l -bn -ci -i 2 -w .
```

plugins/20_events/commands

@@ -1,12 +1,13 @@
 #!/usr/bin/env bash
 [[ " help events:help " == *" $1 "* ]] || exit "$DOKKU_NOT_IMPLEMENTED_EXIT"
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 
 case "$1" in
   help | events:help)
-    help_content_func () {
+    help_content_func() {
       declare desc="return events plugin help content"
-      cat<<help_content
+      cat <<help_content
     events [-t], Show the last events (-t follows)
     events:list, List logged events
     events:on, Enable events logger
@@ -14,15 +15,15 @@ case "$1" in
 help_content
     }
 
-    if [[ $1 = "events:help" ]] ; then
-        echo 'Usage: dokku events:COMMAND [-t]'
-        echo ''
-        echo 'Interact with Dokku event logger.'
-        echo ''
-        echo 'Additional commands:'
-        help_content_func | sort | column -c2 -t -s,
+    if [[ $1 == "events:help" ]]; then
+      echo 'Usage: dokku events:COMMAND [-t]'
+      echo ''
+      echo 'Interact with Dokku event logger.'
+      echo ''
+      echo 'Additional commands:'
+      help_content_func | sort | column -c2 -t -s,
     else
-        help_content_func
+      help_content_func
     fi
     ;;
 
@@ -31,4 +32,3 @@ help_content
     ;;
 
 esac
-

plugins/20_events/hook

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 [[ ! "$DOKKU_EVENTS" ]] || dokku_log_plugn_trigger_call "$(basename "$0")" "$@"

plugins/20_events/install

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 DOKKU_RSYSLOG_FILTER_DIR=/etc/rsyslog.d
@@ -13,7 +14,7 @@ flag_rsyslog_needs_restart=n
 # shellcheck disable=SC2174
 mkdir -m 775 -p "$DOKKU_LOGS_DIR"
 case "$DOKKU_DISTRO" in
-  arch|debian|centos|rhel)
+  arch | debian | centos | rhel)
     chgrp dokku "$DOKKU_LOGS_DIR"
     ;;
   *)
@@ -21,10 +22,10 @@ case "$DOKKU_DISTRO" in
     ;;
 esac
 
-if [[ ! -f  "$DOKKU_EVENTS_LOGFILE" ]]; then
+if [[ ! -f "$DOKKU_EVENTS_LOGFILE" ]]; then
   touch "$DOKKU_EVENTS_LOGFILE"
   case "$DOKKU_DISTRO" in
-    arch|debian|centos|rhel)
+    arch | debian | centos | rhel)
       chgrp dokku "$DOKKU_EVENTS_LOGFILE"
       ;;
     *)
@@ -35,7 +36,7 @@ if [[ ! -f  "$DOKKU_EVENTS_LOGFILE" ]]; then
   chmod 664 "$DOKKU_EVENTS_LOGFILE"
 fi
 
-if [[ -d "$DOKKU_RSYSLOG_FILTER_DIR" && ! -f  "$DOKKU_RSYSLOG_FILTER" ]]; then
+if [[ -d "$DOKKU_RSYSLOG_FILTER_DIR" && ! -f "$DOKKU_RSYSLOG_FILTER" ]]; then
   cat >"$DOKKU_RSYSLOG_FILTER" <<EOF
 :syslogtag, contains, "dokku" $DOKKU_EVENTS_LOGFILE
 EOF
@@ -59,7 +60,7 @@ $DOKKU_LOGS_DIR/*.log {
 }
 EOF
 
-  if [[ "$DOKKU_DISTRO" = "debian" ]]; then
+  if [[ "$DOKKU_DISTRO" == "debian" ]]; then
     sed -i 's/ syslog dokku$/ root dokku/g' $DOKKU_LOGROTATE_FILE
   fi
 

plugins/20_events/subcommands/default

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 events_main_cmd() {

plugins/20_events/subcommands/list

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 events_list_cmd() {

plugins/20_events/subcommands/off

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 events_off_cmd() {

plugins/20_events/subcommands/on

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
 
 events_on_cmd() {
@@ -7,7 +8,7 @@ events_on_cmd() {
   local cmd="events:on"
   echo "Enabling dokku events logger"
   [[ -d $DOKKU_ROOT/.dokkurc ]] || mkdir -p "$DOKKU_ROOT/.dokkurc"
-  echo "export DOKKU_EVENTS=1" > "$DOKKU_ROOT/.dokkurc/DOKKU_EVENTS"
+  echo "export DOKKU_EVENTS=1" >"$DOKKU_ROOT/.dokkurc/DOKKU_EVENTS"
 }
 
 events_on_cmd "$@"