Chore: Deps: Use latest 17 jre image

.github/dependabot.yml

@@ -14,6 +14,23 @@ updates:
     - "type/dependencies"
     - "scope/backend"
 
+- package-ecosystem: docker
+  directory: "/api"
+  schedule:
+    interval: weekly
+    time: "10:00"
+    timezone: Europe/London
+  reviewers:
+    - "kafbat/backend"
+  open-pull-requests-limit: 10
+  ignore:
+  - dependency-name: "azul/zulu-openjdk-alpine"
+    # Limit dependabot pull requests to minor Java upgrades
+    update-types: ["version-update:semver-major"]
+  labels:
+    - "type/dependencies"
+    - "scope/backend"
+
 - package-ecosystem: npm
   directory: "/frontend"
   schedule:

api/Dockerfile

@@ -1,4 +1,7 @@
-FROM azul/zulu-openjdk-alpine:17.0.11-jre-headless
+# The tag is ignored when a sha is included but the reason to add it are:  
+# 1. Self Documentation: It is difficult to find out what the expected tag is given a sha alone
+# 2. Helps dependabot during discovery of upgrades
+FROM azul/zulu-openjdk-alpine:17-jre-headless-latest@sha256:af4df00adaec356d092651af50d9e80fd179f96722d267e79acb564aede10fda
 
 RUN apk add --no-cache \
     # snappy codec