cleanup

[steffyP]

Fixes:

• fix issue with referencing the GH_ACTION_VERSION using github.head_ref that caused problems for branch-names containing /
• clean up + fix of the CI tests in .github/workflows/ci.yml
  • Test LocalStack Version - installs an older version of LS, including the use of the old env LOCALSTACK_API_KEY
  • Test Cloud Pods Action + Test Loading Cloud Pod: creates and uploads a cloud pod, then starts a new localstack instance injecting the cloud pod
  • Test Local State Save Action + Test Local State Load Action: exports the state locally (uploaded as artifact), and imports the state in a new instance

Additions:

• add workflow_dispatch to the empheral.yml

General cleanup:

• update the upload-artifact and download-artifact action
• add description to the action.yml files
• updated the use of LOCALSTACK_AUTH_TOKEN and remove outdated references to api key
  • including README update
• updated the LICENSE copyright year + owner

TODO

• fixup tests in emphermal.yml (api seems to have issues currently though)
• cleanup ephermal actions (descriptions, update upload-artifact and download-artifact actions)
• check and potentially update other third party actions

[github-actions]

⚡️ Running CI build with LocalStack ...