Split out armhf snap build into individual matrixed jobs

.github/workflows/snap_packaging_jobs.yml

@@ -88,11 +88,18 @@ jobs:
           name: snap-${{ matrix.dns-dir }}-${{ matrix.build-for }}
           path: ${{ steps.build.outputs.snap }}
   launchpad_build_all:
-    name: Build armhf snaps
+    name: Build ${{ matrix.target }} armhf
     runs-on:
       - ubuntu-24.04
     env:
       SNAP_ARCH: "armhf"
+    needs: generate_dns_list_matrix
+    strategy:
+      fail-fast: false
+      matrix:
+        target: ${{ fromJSON(needs.generate_dns_list_matrix.outputs.dns-dirs) }}
+        include:
+          - target: certbot
     steps:
     - name: checkout
       uses: actions/checkout@v6.0.2
@@ -115,15 +122,15 @@ jobs:
         git config --global user.name "41898282+github-actions[bot]@users.noreply.github.com"
         mkdir -p ~/.local/share/snapcraft/
         echo "$LAUNCHPAD_CREDS" > ~/.local/share/snapcraft/launchpad-credentials
-        python3 tools/snap/build_remote.py ALL --archs "$SNAP_ARCH" --timeout "$SNAP_BUILD_TIMEOUT"
+        python3 tools/snap/build_remote.py ${{ matrix.target }} --archs "$SNAP_ARCH" --timeout "$SNAP_BUILD_TIMEOUT"
     - name: Flatten snaps layout
       run: |-
-        mv *.snap ${{ runner.temp }}
-        mv certbot-dns-*/*.snap ${{ runner.temp }}
-    - name: Store snaps artifacts
+        mv *.snap ${{ runner.temp }} || true
+        mv certbot-dns-*/*.snap ${{ runner.temp }} || true
+    - name: Store snap artifact
       uses: actions/upload-artifact@v7.0.0
       with:
-        name: snaps_${{ env.SNAP_ARCH }}
+        name: snap-${{ matrix.target }}-${{ env.SNAP_ARCH }}
         path: "${{ runner.temp }}/*.snap"
   snap_run:
     name: Test certbot ${{ matrix.arch-name }}
@@ -167,14 +174,7 @@ jobs:
       run: |-
         python3 -m venv venv
         venv/bin/python tools/pip_install.py -U tox
-    - name: Retrieve Certbot snaps armhf
-      if: ${{ matrix.arch-name == 'armhf' }}
-      uses: actions/download-artifact@v8.0.1
-      with:
-        name: snaps_${{ matrix.arch-name }}
-        path: "${{ github.workspace }}/snap"
-    - name: Retrieve Certbot snaps non-armhf
-      if: ${{ matrix.arch-name != 'armhf' }}
+    - name: Retrieve Certbot snap
       uses: actions/download-artifact@v8.0.1
       with:
         pattern: snap-certbot-${{ matrix.arch-name }}
@@ -224,13 +224,7 @@ jobs:
     - uses: actions/setup-python@v6.2.0
       with:
         python-version: '3.12'
-    - name: Retrieve Certbot snaps armhf
-      if: ${{ matrix.arch-name == 'armhf' }}
-      uses: actions/download-artifact@v8.0.1
-      with:
-        name: snaps_${{ matrix.arch-name }}
-        path: "${{ github.workspace }}/snap"
-    - name: Retrieve Certbot snaps non-armhf
+    - name: Retrieve snaps
       if: ${{ matrix.arch-name != 'armhf' }}
       uses: actions/download-artifact@v8.0.1
       with: