Create Dependabot config file (#562)

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

.github/dependabot.yml

@@ -0,0 +1,58 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/addon"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 99
+  labels:
+  - addon
+- package-ecosystem: pip
+  directory: "/bot"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 99
+  labels:
+  - bot
+- package-ecosystem: docker
+  directory: "/backend"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 99
+  labels:
+  - backend
+- package-ecosystem: docker
+  directory: "/bot"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 99
+  labels:
+  - bot
+- package-ecosystem: pip
+  directory: "/tools"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 99
+  labels:
+  - tools
+- package-ecosystem: pip
+  directory: "/events"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 99
+  labels:
+  - events
+- package-ecosystem: pip
+  directory: "/backend"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 99
+  labels:
+  - backend
+- package-ecosystem: npm
+  directory: "/frontend"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 99
+  labels:
+  - frontend