Merge pull request #792 from alan-turing-institute/staging

chore: group dependabot updates and skip Docker build on PRs

Author: chrisdburr

.github/dependabot.yml

@@ -8,6 +8,14 @@ updates:
     open-pull-requests-limit: 10
     labels:
       - "dependencies"
+    groups:
+      minor-and-patch:
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        update-types:
+          - "major"
   - package-ecosystem: "github-actions"
     directory: "/"
     target-branch: "staging"
@@ -17,3 +25,7 @@ updates:
     labels:
       - "dependencies"
       - "ci"
+    groups:
+      actions:
+        patterns:
+          - "*"