added SPDX header information to some files

In the end of this progress Friendica will hopefully be [REUSE](https://reuse.software) complient but this is a longterm goal.

.woodpecker/.code_standards_check.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2010 - 2024 the Friendica project
+#
+# SPDX-License-Identifier: CC0-1.0
+
 steps:
   restore_cache:
     image: meltwater/drone-cache:dev

.woodpecker/.continuous-deployment.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2010 - 2024 the Friendica project
+#
+# SPDX-License-Identifier: CC0-1.0
+
 depends_on:
   - phpunit
   - code_standards_check

.woodpecker/.database_checks.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2010 - 2024 the Friendica project
+#
+# SPDX-License-Identifier: CC0-1.0
+
 matrix:
   include:
     - PHP_MAJOR_VERSION: 8.2

.woodpecker/.license_check.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2010 - 2024 the Friendica project
+#
+# SPDX-License-Identifier: CC0-1.0
+
 steps:
   check:
     image: friendicaci/php-cs

.woodpecker/.messages.po_check.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2010 - 2024 the Friendica project
+#
+# SPDX-License-Identifier: CC0-1.0
+
 steps:
   build_xgettext:
     image: friendicaci/transifex

.woodpecker/.phpunit.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2010 - 2024 the Friendica project
+#
+# SPDX-License-Identifier: CC0-1.0
+
 matrix:
   include:
     - PHP_MAJOR_VERSION: 7.4

.woodpecker/.releaser.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2010 - 2024 the Friendica project
+#
+# SPDX-License-Identifier: CC0-1.0
+
 depends_on:
   - phpunit
   - code_standards_check