De-parallelise CI (#20171)

* De-parallelise CI

No speed increase.

* Update .github/workflows/ci_builds.yml

.github/workflows/ci_builds.yml

@@ -20,7 +20,6 @@ jobs:
     strategy:
       matrix:
         keymap: [default, via]
-        keyboard_folder: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]
 
     container: qmkfm/qmk_cli
 
@@ -35,13 +34,13 @@ jobs:
     - name: Install dependencies
       run: pip3 install -r requirements.txt
 
-    - name: Run `qmk mass-compile` (keyboards ${{ matrix.keyboard_folder }}*, keymap ${{ matrix.keymap }})
+    - name: Run `qmk mass-compile` (keymap ${{ matrix.keymap }})
-      run: qmk mass-compile -j $(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null) -km ${{ matrix.keymap }} -f 'keyboard_folder=${{ matrix.keyboard_folder }}*'
+      run: qmk mass-compile -j $(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null) -km ${{ matrix.keymap }}
 
     - name: 'Upload binaries'
       uses: actions/upload-artifact@v3
       with:
-        name: binaries-${{ matrix.keyboard_folder }}-${{ matrix.keymap }}
+        name: binaries-${{ matrix.keymap }}
         if-no-files-found: ignore
         path: |
           *.bin