Add Docker updates to dependabot config

[nicokempe]

• Added Docker entries to the dependabot.yml file
• Enables automated updates for Docker dependencies
• Schedule set for daily updates at 06:00 in Europe/Berlin timezone
• Allows up to 99 open pull requests for Docker updates

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Release Notes:

Add Docker updates to dependabot config

For the submitter:

• I updated the documentation and will supply links to the specific files
• I did not update the documentation
• I included a link to the SonarCloud branch analysis
• After integration of the PR, I added a description of changes on the current release notes
• I did not update the current release notes
• I put the ticket in review
• After integration of the pull request, I verified our bluemix test environment is not broken

Verified by the reviewer:

• Commit message format → (Closes) #: Your commit message. i.e. Closes Commit Hooks won't work without JIRA Tickets #2271: Your commit message.
• Submitter's update to documentation is sufficient
• SonarCloud analysis meets our standards
• Update of the current release notes reflects changes
• PR fulfills the ticket
• Edge cases and unwanted side effects are tested
• Readability

[mustaphazorgati]

What are we trying to achieve with this?
Our databases are updated manually :)

[arolfes]

Hi @nicokempe, , please sync fork with current master and rebase this PR.
I will take on the merge later. thank you