rename woodpecker "pipeline" to "steps"

.woodpecker/.code_standards_check.yml

@@ -1,4 +1,4 @@
-pipeline:
+steps:
   restore_cache:
     image: meltwater/drone-cache:dev
     settings:

.woodpecker/.continuous-deployment.yml

@@ -11,7 +11,7 @@ labels:
 
 skip_clone: true
 
-pipeline:
+steps:
   clone:
     image: alpine/git
     commands:

.woodpecker/.database_checks.yml

@@ -6,7 +6,7 @@ matrix:
 branches:
   exclude: [ stable ]
 
-pipeline:
+steps:
   db_version_match:
     image: friendicaci/transifex
     commands:

.woodpecker/.license_check.yml

@@ -1,4 +1,4 @@
-pipeline:
+steps:
   check:
     image: friendicaci/php-cs
     commands:

.woodpecker/.messages.po_check.yml

@@ -1,4 +1,4 @@
-pipeline:
+steps:
   build_xgettext:
     image: friendicaci/transifex
     commands:

.woodpecker/.phpunit.yml

@@ -15,7 +15,7 @@ matrix:
 labels:
   location: opensocial
 
-pipeline:
+steps:
   php-lint:
     image: php:${PHP_MAJOR_VERSION}
     group: lint

.woodpecker/.releaser.yml

@@ -9,7 +9,7 @@ labels:
 
 skip_clone: true
 
-pipeline:
+steps:
   clone:
     image: alpine/git
     commands: