Revert "Consolidate variant build steps (#4806)" (#4816)

This reverts commit 9f8d86cb25.

.github/workflows/build_nrf52.yml

@@ -11,14 +11,24 @@ jobs:
   build-nrf52:
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
+      - name: Build base
+        id: base
+        uses: ./.github/actions/setup-base
+
       - name: Build NRF52
-        id: build
-        uses: ./.github/actions/build-variant
+        run: bin/build-nrf52.sh ${{ inputs.board }}
+
+      - name: Get release version string
+        run: echo "version=$(./bin/buildinfo.py long)" >> $GITHUB_OUTPUT
+        id: version
+
+      - name: Store binaries as an artifact
+        uses: actions/upload-artifact@v4
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          board: ${{ inputs.board }}
-          build-script-path: bin/build-nrf52.sh
-          artifact-paths: |
+          name: firmware-${{ inputs.board }}-${{ steps.version.outputs.version }}.zip
+          overwrite: true
+          path: |
             release/*.hex
             release/*.uf2
             release/*.elf