revert to a single job

would have to jump through hoops to pass digest output between jobs given we have a testing matrix.
Github is still working on implementing the functionality - actions/runner#2477

.github/workflows/build_test.yml

@@ -19,7 +19,7 @@ on:
       - 'CHANGELOG.rst'
 
 jobs:
-  cyclus-job:
+  build-test-cyclus:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -34,7 +34,8 @@ jobs:
         ]
 
     outputs:
-      cyclus-${{matrix.ubuntu_versions}}-${{matrix.pkg_mgr}}-digest: ${{ steps.build-cyclus.outputs.digest }}
+      cycamore-build-failure: ${{ steps.build-cycamore.outcome }} != 'success'
+      cymetric-build-failure: ${{ steps.build-cymetric.outcome }} != 'success'
 
     steps:
       - name: Log in to the Container registry
@@ -63,118 +64,58 @@ jobs:
             pkg_mgr=${{ matrix.pkg_mgr }}
             ubuntu_version=${{ matrix.ubuntu_versions }}
 
-
-  cycamore-job:
-    runs-on: ubuntu-latest
-    needs: [ cyclus-job ]
-    if: ${{ github.event_name == 'pull_request' }}
-    continue-on-error: true
-    strategy:
-      fail-fast: false
-      matrix:
-        ubuntu_versions : [
-          20.04,
-          22.04,
-        ]
-        pkg_mgr : [
-          apt,
-          conda,
-        ]
-
-    outputs:
-      cycamore-build-failure: ${{ steps.build-cycamore.outcome }} != 'success'
-      cycamore-${{}}-digest: ${{ steps.build-cycamore.outputs.digest }}
-
-    steps:
-      - name: Log in to the Container registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
       - name: Checkout Cycamore
         if: ${{ github.event_name == 'pull_request' }}
         uses: actions/checkout@v4
         with:
           repository: bennibbelink/cycamore
           ref: ci-test
+          path: ${{ github.workspace }}/cycamore
 
       - name: Build Cycamore
-        env:
-          cyclus-digest: ${{needs.cyclus-job.outputs.digest}}
         id: build-cycamore
+        if: ${{ github.event_name == 'pull_request' }}
+        continue-on-error: true
         uses: docker/build-push-action@v5
         with:
-          file: docker/Dockerfile
+          file: ${{ github.workspace }}/cycamore/docker/Dockerfile
           cache-from: type=registry,ref=ghcr.io/cyclus/cycamore_${{ matrix.ubuntu_versions }}_${{ matrix.pkg_mgr }}/cycamore:ci-layer-cache
           cache-to: type=registry,ref=ghcr.io/cyclus/cycamore_${{ matrix.ubuntu_versions }}_${{ matrix.pkg_mgr }}/cycamore:ci-layer-cache,mode=max
           tags: ghcr.io/cyclus/cycamore_${{ matrix.ubuntu_versions }}_${{ matrix.pkg_mgr }}/cycamore:ci-image-cache
           push: true
           build-args: |
             pkg_mgr=${{ matrix.pkg_mgr }}
             ubuntu_version=${{ matrix.ubuntu_versions }}
-            cyclus_tag=ci-image-cache@${{needs.cyclus-job.outputs.cyclus-${{matrix.ubuntu_versions}}-${{matrix.pkg_mgr}}-digest}}
-
-
-  cymetric-job:
-    runs-on: ubuntu-latest
-    needs: [ cyclus-job, cycamore-job ]
-    if: ${{ github.event_name == 'pull_request' }}
-    continue-on-error: true
-    strategy:
-      fail-fast: false
-      matrix:
-        ubuntu_versions : [
-          20.04,
-          22.04,
-        ]
-        pkg_mgr : [
-          apt,
-          conda,
-        ]
+            cyclus_tag=ci-image-cache@${{ steps.build-cyclus.outputs.digest }}
 
-    outputs:
-      cymetric-build-failure: ${{ steps.build-cymetric.outcome }} != 'success'
-
-    steps:
-      - name: Log in to the Container registry
-        uses: docker/login-action@v3
-        with:
-          registry: ghcr.io
-          username: ${{ github.repository_owner }}
-          password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
       - name: Checkout Cymetric
+        if: ${{ github.event_name == 'pull_request' }}
         uses: actions/checkout@v4
         with:
           repository: bennibbelink/cymetric
           ref: ci-test
+          path: ${{ github.workspace }}/cymetric
 
       - name: Build Cymetric
+        if: ${{ github.event_name == 'pull_request' }}
         id: build-cymetric
+        continue-on-error: true
         uses: docker/build-push-action@v5
         with:
-          file: docker/Dockerfile
+          file: ${{ github.workspace }}/cycamore/docker/Dockerfile
           cache-from: type=registry,ref=ghcr.io/cyclus/cymetric_${{ matrix.ubuntu_versions }}_${{ matrix.pkg_mgr }}/cymetric:ci-layer-cache
           cache-to: type=registry,ref=ghcr.io/cyclus/cymetric_${{ matrix.ubuntu_versions }}_${{ matrix.pkg_mgr }}/cymetric:ci-layer-cache,mode=max
           tags: ghcr.io/cyclus/cymetric_${{ matrix.ubuntu_versions }}_${{ matrix.pkg_mgr }}/cymetric:ci-image-cache
           push: true
           build-args: |
             pkg_mgr=${{ matrix.pkg_mgr }}
             ubuntu_version=${{ matrix.ubuntu_versions }}
-            cycamore_tag=ci-image-cache@${{ steps.cycamore-job.outputs.digest }}
+            cycamore_tag=ci-image-cache@${{ steps.build-cycamore.outputs.digest }}
             
   comment-downstream-statuses:
     runs-on: ubuntu-latest
     if: ${{ github.event_name == 'pull_request' }}
-    needs: [ cyclus-job, cycamore-job, cymetric-job ]
+    needs: [ build-test-cyclus ]
     permissions:
       pull-requests: write
 
@@ -185,5 +126,5 @@ jobs:
           comment_tag: downstream_statuses
           message: |
             ## Downstream Build Statuses using Cyclus ${{ github.ref }}
-            - Cycamore: ${{needs.cycamore-job.outputs.cycamore-build-failure && '**Failure** :warning:' || '*Success* :white_check_mark:'}}
-            - Cymetric: ${{needs.cymetric-job.outputs.cymetric-build-failure && '**Failure** :warning:' || '*Success* :white_check_mark:'}}
+            - Cycamore: ${{needs.build-test-cyclus.outputs.cycamore-build-failure && '**Failure** :warning:' || '*Success* :white_check_mark:'}}
+            - Cymetric: ${{needs.built-test-cyclus.outputs.cymetric-build-failure && '**Failure** :warning:' || '*Success* :white_check_mark:'}}