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/tar/commands

@@ -1,7 +1,8 @@
 #!/usr/bin/env bash
 [[ " help tar:help " == *" $1 "* ]] || exit "$DOKKU_NOT_IMPLEMENTED_EXIT"
 source "$PLUGIN_AVAILABLE_PATH/tar/internal-functions"
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 
 case "$1" in
   help | tar:help)

plugins/tar/deploy-source

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 
 tar_deploy_source() {
   declare desc="tar deploy-source plugin trigger"

plugins/tar/functions

@@ -1,11 +1,13 @@
 #!/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"
 source "$PLUGIN_AVAILABLE_PATH/config/functions"
 
 tar_build() {
   declare desc="builds apps from tarball via command line"
-  local APP="$1"; verify_app_name "$APP"
+  local APP="$1"
+  verify_app_name "$APP"
   shift 1
 
   # clean up after ourselves
@@ -14,7 +16,7 @@ tar_build() {
 
   # extract tar file
   chmod 755 "$TAR_BUILD_TMP_WORK_DIR"
-  pushd "$TAR_BUILD_TMP_WORK_DIR" > /dev/null
+  pushd "$TAR_BUILD_TMP_WORK_DIR" >/dev/null
 
   # Detect a common prefix that all files in the tar have, and strip off each directory found in it
   local COMMON_PREFIX=$(tar -tf "$DOKKU_ROOT/$APP/src.tar" | sed -e 'N;s/^\(.*\).*\n\1.*$/\1\n\1/;D')
@@ -42,7 +44,10 @@ tar_trigger_build() {
   declare APP="$1" TMP_WORK_DIR="$2" REV="$3"
 
   plugn trigger post-extract "$APP" "$TMP_WORK_DIR" "$REV"
-  if [[ -f Dockerfile ]] && [[ "$([[ -f .env ]] && grep -q BUILDPACK_URL .env; echo $?)" != "0" ]] && [[ ! -f ".buildpacks" ]] && [[ -z $(config_get "$APP" BUILDPACK_URL || true) ]]; then
+  if [[ -f Dockerfile ]] && [[ "$(
+    [[ -f .env ]] && grep -q BUILDPACK_URL .env
+    echo $?
+  )" != "0" ]] && [[ ! -f ".buildpacks" ]] && [[ -z $(config_get "$APP" BUILDPACK_URL || true) ]]; then
     plugn trigger pre-receive-app "$APP" "dockerfile" "$TMP_WORK_DIR" "$REV"
     dokku_receive "$APP" "dockerfile" "$TMP_WORK_DIR"
   else

plugins/tar/internal-functions

@@ -1,16 +1,17 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 
 tar_help_content_func() {
   declare desc="return tar plugin help content"
-  cat<<help_content
+  cat <<help_content
     tar:in <app>, Reads an tarball containing the app from stdin
     tar:from <app> <url>, Loads an app tarball from url
 help_content
 }
 
 tar_help_cmd() {
-  if [[ $1 = "tar:help" ]] ; then
+  if [[ $1 == "tar:help" ]]; then
     echo -e 'Usage: dokku tar[:COMMAND]'
     echo ''
     echo 'An alternative to using git, apps are loaded via tarballs instead.'
@@ -20,7 +21,7 @@ tar_help_cmd() {
   elif [[ $(ps -o command= $PPID) == *"--all"* ]]; then
     tar_help_content_func
   else
-    cat<<help_desc
+    cat <<help_desc
     tar, Deploy applications via tarball instead of git
 help_desc
   fi

plugins/tar/receive-app

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_AVAILABLE_PATH/tar/functions"
 
 tar_receive_app "$@"

plugins/tar/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_AVAILABLE_PATH/tar/internal-functions"
 
 tar_help_cmd "tar:help"

plugins/tar/subcommands/from

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_AVAILABLE_PATH/tar/functions"
 
 tar_from_cmd "$@"

plugins/tar/subcommands/in

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_AVAILABLE_PATH/tar/functions"
 
 tar_in_cmd "$@"