Restructure config schema with distro as top-level key

- Changed from builds/manifests sections to distro-based organization
- Each distro (debian/ubuntu) now contains ci.paths and manifests
- Updated workflow filters to use new paths (.debian.ci, .ubuntu.ci, etc)
- Addresses feedback from @phlax

Co-authored-by: phlax <454682+phlax@users.noreply.github.com>

Author: Copilot

.github/config.yml

@@ -1,8 +1,11 @@
 # Configuration for envoy-build-tools CI/CD
+# Each distro (debian/ubuntu) contains:
+# - ci.paths: Path-based build detection
+# - manifests: OCI manifest specifications
+# Note: {sha} placeholder will be replaced with the actual docker SHA at runtime
 
-# Path-based build detection - determines which distros to build based on changed files
-builds:
-  debian:
+debian:
+  ci:
     paths:
     - docker/linux/debian/**
     - docker/linux/debian_build.sh
@@ -11,19 +14,7 @@ builds:
     - docker/linux/common_fun.sh
     - docker/linux/group_manifests.sh
     - .github/workflows/**
-  ubuntu:
-    paths:
-    - docker/linux/ubuntu/**
-    - docker/push.sh
-    - docker/linux/build.sh
-    - docker/linux/common_fun.sh
-    - docker/linux/group_manifests.sh
-    - .github/workflows/**
-
-# Manifest configuration templates - defines OCI manifest specifications
-# Note: {sha} placeholder will be replaced with the actual docker SHA at runtime
-manifests:
-  debian:
+  manifests:
   - name: envoy-build
     tag: devtools-{sha}
     registry: docker.io/envoyproxy
@@ -92,7 +83,17 @@ manifests:
     architectures:
     - amd64
     artifact-pattern: oci-debian-{arch}/debian-mobile-{sha}-{arch}.tar
-  ubuntu:
+
+ubuntu:
+  ci:
+    paths:
+    - docker/linux/ubuntu/**
+    - docker/push.sh
+    - docker/linux/build.sh
+    - docker/linux/common_fun.sh
+    - docker/linux/group_manifests.sh
+    - .github/workflows/**
+  manifests:
   - name: envoy-build-ubuntu
     tag: ci-{sha}
     registry: docker.io/envoyproxy

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
         input: .github/config.yml
         input-format: yaml-path
         filter: |
-          .builds
+          {debian: .debian.ci, ubuntu: .ubuntu.ci}
     - uses: envoyproxy/toolshed/gh-actions/torun@actions-v0.3.30
       id: torun
       with:
@@ -140,7 +140,7 @@ jobs:
         input: .github/config.yml
         input-format: yaml-path
         filter: >-
-          .manifests.debian
+          .debian.manifests
           | map(. + {
               tag: (.tag | gsub("{sha}"; "${{ steps.docker-sha.outputs.sha }}")),
               "artifact-pattern": (.["artifact-pattern"] | gsub("{sha}"; "${{ steps.docker-sha.outputs.sha }}")),
@@ -155,7 +155,7 @@ jobs:
         input: .github/config.yml
         input-format: yaml-path
         filter: >-
-          .manifests.ubuntu
+          .ubuntu.manifests
           | map(. + {
               tag: (.tag | gsub("{sha}"; "${{ steps.docker-sha.outputs.sha }}")),
               "artifact-pattern": (.["artifact-pattern"] | gsub("{sha}"; "${{ steps.docker-sha.outputs.sha }}")),