Update template docker images using Dependabot

.github/dependabot.yml

@@ -18,3 +18,56 @@ updates:
       interval: "daily"
     labels:
       - "update"
+
+  # Enable version updates for Docker
+  # We need to specify each Dockerfile in a separate entry because Dependabot doesn't
+  # support wildcards or recursively checking subdirectories. Check this issue for updates:
+  # https://github.com/dependabot/dependabot-core/issues/2178
+  - package-ecosystem: "docker"
+    directory: "{{cookiecutter.project_slug}}/compose/local/django/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "update"
+
+  - package-ecosystem: "docker"
+    directory: "{{cookiecutter.project_slug}}/compose/local/docs/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "update"
+
+  - package-ecosystem: "docker"
+    directory: "{{cookiecutter.project_slug}}/compose/local/node/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "update"
+
+  - package-ecosystem: "docker"
+    directory: "{{cookiecutter.project_slug}}/compose/production/aws/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "update"
+
+  - package-ecosystem: "docker"
+    directory: "{{cookiecutter.project_slug}}/compose/production/django/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "update"
+
+  - package-ecosystem: "docker"
+    directory: "{{cookiecutter.project_slug}}/compose/production/postgres/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "update"
+
+  - package-ecosystem: "docker"
+    directory: "{{cookiecutter.project_slug}}/compose/production/traefik/"
+    schedule:
+      interval: "daily"
+    labels:
+      - "update"