feat: Add Dependabot auto-merge workflow#287

Marenz wants to merge 1 commit intofrequenz-floss:v0.x.xfrequenz-floss/frequenz-api-dispatch:v0.x.xfrom

Marenz:add-dependabot-workflowMarenz/frequenz-api-dispatch:add-dependabot-workflowCopy head branch name to clipboard