matrix values cannot contain runtime computed val

Author: robbycochran

.github/workflows/collector-builder.yml

@@ -31,6 +31,7 @@ jobs:
     outputs:
       build-image: ${{ steps.builder-tag.outputs.build-image || false }}
       collector-builder-tag: ${{ steps.builder-tag.outputs.collector-builder-tag || 'master'}}
+      local-exclude: ${{ steps.builder-tag.outputs.local-exclude || ''}}
 
     env:
       DEFAULT_BUILDER_TAG: master
@@ -69,6 +70,12 @@ jobs:
           echo "collector-builder-tag=${COLLECTOR_BUILDER_TAG}" >> "$GITHUB_OUTPUT"
           echo "build-image=true" >> "$GITHUB_OUTPUT"
 
+      - name: Check arches for local build
+        if: ! contains(inputs.architectures, 'ppc64le')
+        id: arch
+        run: |
+          echo "local-exclude=[{arch:ppc64le}]" >> "$GITHUB_OUTPUT"
+
   build-builder-image:
     name: Local builder image
     # Multiarch builds sometimes take for eeeeeeeeeever
@@ -80,8 +87,7 @@ jobs:
     strategy:
       matrix:
         arch: [amd64, arm64, ppc64le]
-        exclude:
-          - arch: ${{ contains(inputs.architectures, 'ppc64le') && '' || 'ppc64le' }}
+        exclude: ${{ fromJSON(needs.builder-needs-rebuilding.outputs.local-exclude) }}
     runs-on: ${{ (matrix.arch == 'arm64' && 'ubuntu-24.04-arm') || 'ubuntu-24.04' }}
 
     env:

.github/workflows/collector.yml

@@ -33,13 +33,25 @@ env:
   ADDRESS_SANITIZER: ${{ contains(github.event.pull_request.labels.*.name, 'address-sanitizer') }}
 
 jobs:
+  prepare-build-collector:
+    name: Prepare builders for collector
+    runs-on: ubuntu-24.04
+    outputs:
+      local-exclude: ${{ steps.arch.outputs.local-exclude || '' }}
+
+    steps:
+      - name: Check arches for local build
+        if: ! contains(inputs.architectures, 'ppc64le')
+        id: arch
+        run: echo "local-exclude=[{arch:ppc64le}]" >> "$GITHUB_OUTPUT"
+
   build-collector-image:
     name: Local collector image ${{ matrix.arch }}
+    needs: prepare-build-collector
     strategy:
       matrix:
         arch: [amd64, arm64, ppc64le]
-        exclude:
-          - arch: ${{ contains(inputs.architectures, 'ppc64le') && '' || 'ppc64le' }}
+        exclude: ${{ fromJSON(needs.prepare-build-collector.outputs.local-exclude) }}
     runs-on: ${{ (matrix.arch == 'arm64' && 'ubuntu-24.04-arm') || 'ubuntu-24.04' }}
 
     env: