feat: custom base image to pre-bake apt updates

.woodpecker/base-image.yml

@@ -0,0 +1,18 @@
+when:
+  - event: manual
+  - event: cron
+    cron: weekly-base-image
+
+steps:
+  build-base:
+    image: woodpeckerci/plugin-docker-buildx:latest
+    privileged: true
+    settings:
+      registry: git.mosaicstack.dev
+      repo: git.mosaicstack.dev/mosaic/node-base
+      tags: 24-slim
+      dockerfile: docker/base.Dockerfile
+      username:
+        from_secret: gitea_user
+      password:
+        from_secret: gitea_token