feat: add metrics-server functional layer (#865)

## Description

Adds the functional layer for metrics-server.

## Related Issue

Related to #820

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [x] Test, docs, adr added or updated as needed
- [x] [Contributor
Guide](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)
followed

.github/filters.yaml

@@ -27,3 +27,7 @@ runtime-security:
 backup-restore:
   - "packages/backup-restore/**"
   - "src/velero/**"
+
+metrics-server:
+  - "packages/metrics-server/**"
+  - "src/metrics-server/**"

.github/workflows/publish.yaml

@@ -93,7 +93,7 @@ jobs:
     strategy:
       matrix:
         flavor: [upstream, registry1, unicorn]
-        layer: [base, identity-authorization, ui, runtime-security, backup-restore, logging]
+        layer: [base, identity-authorization, ui, runtime-security, backup-restore, logging, metrics-server]
         arch: [amd64, arm64]
         exclude:
           - flavor: registry1

packages/metrics-server/README.md

@@ -0,0 +1,7 @@
+# UDS Core Metrics Server
+
+This layer of UDS Core provides k8s metrics capabilities. Currently it includes the application(s):
+- Metrics Server
+
+To deploy this layer you must also deploy its dependent layer(s):
+- Base

packages/metrics-server/tasks.yaml

@@ -0,0 +1,8 @@
+includes:
+  - metrics-server: ../../src/metrics-server/tasks.yaml
+
+tasks:
+  - name: validate
+    actions:
+      - description: "Validate Metrics Server"
+        task: metrics-server:validate

packages/metrics-server/zarf.yaml

@@ -0,0 +1,16 @@
+kind: ZarfPackageConfig
+metadata:
+  name: core-metrics-server
+  description: "UDS Core (Metrics Server)"
+  authors: "Defense Unicorns - Product"
+  # x-release-please-start-version
+  version: "0.28.0"
+  # x-release-please-end
+  x-uds-dependencies: ["base"]
+
+components:
+  # Metrics Server
+  - name: metrics-server
+    required: true
+    import:
+      path: ../../src/metrics-server

packages/standard/zarf.yaml

@@ -50,7 +50,7 @@ components:
   - name: metrics-server
     required: false
     import:
-      path: ../../src/metrics-server
+      path: ../metrics-server
 
   # Keycloak
   - name: keycloak

release-please-config.json

@@ -20,6 +20,7 @@
         "packages/backup-restore/zarf.yaml",
         "packages/runtime-security/zarf.yaml",
         "packages/ui/zarf.yaml",
+        "packages/metrics-server/zarf.yaml",
         "packages/standard/zarf.yaml",
         "bundles/k3d-slim-dev/uds-bundle.yaml",
         "bundles/k3d-standard/uds-bundle.yaml",