feat: create scaffolding for the DB migration action

Author: agneum

Dockerfile

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+FROM alpine:3.13
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: 'DB migration with DLE'
+description: 'Run DB migrations with the DLE'
+inputs:
+  owner:
+    description: 'The owner of the repository to check'
+    required: true
+outputs:
+  status:
+    description: 'The result of CI checks'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.owner }}

entrypoint.sh

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+#!/bin/sh -l
+
+echo "Owner $1"
+
+status="OK"
+echo "::set-output name=status::$status"