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/ssh-keys/commands

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

plugins/ssh-keys/functions

@@ -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"
 
 list_ssh_keys() {
@@ -15,7 +16,7 @@ verify_ssh_key_file() {
   local key line=0
   while read -r key; do
     line=$((line + 1))
-    ssh-keygen -l -f /dev/stdin <<< "$key" &> /dev/null || dokku_log_fail "${DOKKU_ROOT}/.ssh/authorized_keys line $line failed ssh-keygen check."
+    ssh-keygen -l -f /dev/stdin <<<"$key" &>/dev/null || dokku_log_fail "${DOKKU_ROOT}/.ssh/authorized_keys line $line failed ssh-keygen check."
   done <"${DOKKU_ROOT}/.ssh/authorized_keys"
 }
 

plugins/ssh-keys/internal-functions

@@ -1,9 +1,10 @@
 #!/usr/bin/env bash
-set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
 
 ssh_keys_help_content_func() {
   declare desc="return ssh-keys plugin help content"
-  cat<<help_content
+  cat <<help_content
     ssh-keys:list, List of all authorized dokku public ssh keys
     ssh-keys:add <name> [/path/to/key], Add a new public key by pipe or path
     ssh-keys:remove <name>, Remove SSH public key by name
@@ -11,7 +12,7 @@ help_content
 }
 
 ssh_keys_help_cmd() {
-  if [[ $1 = "ssh-keys:help" ]] ; then
+  if [[ $1 == "ssh-keys:help" ]]; then
     echo -e 'Usage: dokku ssh-keys[:COMMAND]'
     echo ''
     echo 'Manage public ssh keys that are allowed to connect to Dokku'
@@ -21,7 +22,7 @@ ssh_keys_help_cmd() {
   elif [[ $(ps -o command= $PPID) == *"--all"* ]]; then
     ssh_keys_help_content_func
   else
-    cat<<help_desc
+    cat <<help_desc
     ssh-keys, Manage public ssh keys that are allowed to connect to Dokku
 help_desc
   fi

plugins/ssh-keys/subcommands/add

@@ -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"
 source "$PLUGIN_AVAILABLE_PATH/ssh-keys/functions"
 
@@ -10,14 +11,14 @@ add_keys() {
   local name="$1" key_file="$2" key_contents key_from_pipe
   [[ -p /dev/stdin ]] && read -r key_from_pipe
   if [[ -n "$key_from_pipe" ]]; then
-    ssh-keygen -lf /dev/stdin <<< "$key_from_pipe" &> /dev/null || dokku_log_fail "Key piped in is not a valid ssh public key"
+    ssh-keygen -lf /dev/stdin <<<"$key_from_pipe" &>/dev/null || dokku_log_fail "Key piped in is not a valid ssh public key"
     key_contents="$key_from_pipe"
   elif [[ -n "$key_file" ]]; then
     key_contents="$(cat "$key_file")"
-    ssh-keygen -lf /dev/stdin <<< "$key_contents" &> /dev/null || dokku_log_fail "Key from file is not a valid ssh public key"
+    ssh-keygen -lf /dev/stdin <<<"$key_contents" &>/dev/null || dokku_log_fail "Key from file is not a valid ssh public key"
   fi
   [[ -n "$name" && -n "$key_contents" ]] || dokku_log_fail "Two arguments are required if not piping, ie: dokku ssh-keys:add <NAME> <KEY_FILE>"
-  local count="$(wc -l <<< "$key_contents")"
+  local count="$(wc -l <<<"$key_contents")"
   [ "$count" -eq 1 ] || dokku_log_fail 'Too many keys provided, set one per invocation of dokku ssh-keys:add <NAME> <KEY_FILE>'
   create_ssh_key_file
   verify_ssh_key_exists

plugins/ssh-keys/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/ssh-keys/internal-functions"
 
 ssh_keys_help_cmd "ssh-keys:help"

plugins/ssh-keys/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"
 source "$PLUGIN_AVAILABLE_PATH/ssh-keys/functions"
 

plugins/ssh-keys/subcommands/remove

@@ -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"
 source "$PLUGIN_AVAILABLE_PATH/ssh-keys/functions"
 

plugins/ssh-keys/user-auth

@@ -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"
 
 check_ssh_keys_user() {