docker: Refactor feat_set out of base layers.

Signed-off-by: Jason Volk <jason@zemos.net>

.github/workflows/bake.yml

@@ -38,6 +38,10 @@ on:
         type: string
         default: '[]'
         description: Matrix inclusions
+      max-parallel:
+        type: number
+        default: 128
+        description: Limit number of concurrent jobs.
       verbose_env:
         type: string
         default: ${{vars.CI_VERBOSE_ENV || false}}
@@ -82,6 +86,7 @@ jobs:
     runs-on: ${{matrix.machine}}
     strategy:
       fail-fast: ${{inputs.fail_fast}}
+      max-parallel: ${{inputs.max-parallel}}
       matrix:
         exclude: ${{fromJSON(inputs.excludes)}}
         include: ${{fromJSON(inputs.includes)}}