ci: add dependabot for automated dependency updates

- Configure weekly Python dependency updates
- Configure weekly GitHub Actions updates
- Configure weekly Docker base image updates
- Group minor/patch updates together
- Ignore major ML library updates (require manual testing)
- Add appropriate labels for PR organization

Author: Sakeeb91

.github/dependabot.yml

@@ -0,0 +1,73 @@
+# Dependabot configuration for automated dependency updates
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates
+
+version: 2
+updates:
+  # Python dependencies
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+      timezone: "America/New_York"
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "deps"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "python"
+    reviewers:
+      - "Sakeeb91"
+    groups:
+      # Group minor/patch updates together
+      python-minor:
+        patterns:
+          - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      # Security updates always separate
+    ignore:
+      # Ignore major version updates for ML libraries (require manual testing)
+      - dependency-name: "torch"
+        update-types: ["version-update:semver-major"]
+      - dependency-name: "transformers"
+        update-types: ["version-update:semver-major"]
+
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+      timezone: "America/New_York"
+    open-pull-requests-limit: 3
+    commit-message:
+      prefix: "ci"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "github-actions"
+    reviewers:
+      - "Sakeeb91"
+
+  # Docker dependencies
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+      timezone: "America/New_York"
+    open-pull-requests-limit: 2
+    commit-message:
+      prefix: "docker"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "docker"
+    reviewers:
+      - "Sakeeb91"