Added Custom Docker Action which prints fibonacci

action.yml

@@ -0,0 +1,31 @@
+#
+# To be able to use this action (with Gitea and Act Runner),
+# this action.yml file has to be placed in the root of the repository.
+# It is also important that a Git TAG is created (for example 'v1')
+# Then workflows can use this action like this:
+# 'using: https://gitea.coursow.de/Test-Playground/actions-custom-docker@v1'
+#
+
+# Name and Description of the Action (Like displayed in GitHub Marketplace Overview)
+name: 'Print Fibonacci Numbers (Docker Version)'
+description: 'Prints a sequence of fibonacci numbers'
+
+inputs:
+    iterations:
+        description: 'The maximum amount of iterations to produce fibonacci numbers'
+        required: false
+        default: 10
+
+outputs:
+    lastNumber:
+        description: 'The last fibonacci number printed during the execution of the action'
+        # value: ... # The value key is not needed (like nedded with composite actions) because the main.js will set the ouput value
+
+runs:
+    using: 'docker'     # Must be 'docker' for a custom docker action
+    image: 'Dockerfile' # The Dockerfile to build a docker image which will be used to execute the action
+    #image: 'docker://debian:stretch-slim' # Could also use an existing dockerhub image
+    #pre-entrypoint: 'setup.sh'
+    #entrypoints: 'main.sh'
+    #args:
+    #    - 'bzz'