Add ability to create ssh-keys and provide it to github and gitea

Here we start to have some delicate secrets in the code. Therefore I
need a vault for ansible. This vault contains the tokens to upload
ssh-keys to github and my lovely gitea server.

Note, that this change also adds a `requirements.yml`, this is necessary
because I use the paramater "api_url" of the github_key resource which
was only added in v11, but the debian ansible was shippped with an older
collection.

.gitignore

@@ -1,6 +1,7 @@
 *.html
 *.pdf
 group_vars/*/local.config.yml
+password.txt
 
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