APP-178 - Configure Dependabot to open PRs for dependency version upgrades, not just vulnerabilities (#629)

This PR adds a dependabot.yml file to the repo in order to configure Dependabot version updates for the following package ecosystems within this project:

- Docker
- Gradle
- GitHub Actions

Author: JordanGuinn

.github/dependabot.yml

@@ -0,0 +1,52 @@
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  # Enable version updates for Gradle
+  - package-ecosystem: "gradle"
+    directories:
+      - "/"
+      - "/common-util"
+      - "/ldfdata-service"
+      - "/investigation-service"
+      - "/liquibase-service"
+      - "/observation-service"
+      - "/organization-service"
+      - "/person-service"
+      - "/post-processing-service"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 2
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-patch"]
+
+  # Enable version updates for Docker
+  - package-ecosystem: "docker"
+    directories:
+      - "/ldfdata-service"
+      - "/investigation-service"
+      - "/liquibase-service"
+      - "/observation-service"
+      - "/organization-service"
+      - "/person-service"
+      - "/post-processing-service"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 2
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-patch"]
+
+  # Enable version updates for GitHub Actions
+  - package-ecosystem: "github-actions"
+    # Workflow files stored in the default location of `.github/workflows`
+    # You don't need to specify `/.github/workflows` for `directory`. You can use `directory: "/"`.
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 2
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-patch"]