GHA: Change cache key to trigger reconstruction for RTEMS-4.9

.github/workflows/ci-scripts-build.yml

@@ -42,6 +42,7 @@ jobs:
       fail-fast: false
       matrix:
         # Job names also name artifacts, character limitations apply
+        # 'name' is also used for the cache key
         include:
           - os: ubuntu-20.04
             cmp: gcc
@@ -92,8 +93,6 @@ jobs:
             rtems_target: RTEMS-pc686-qemu
             test: NO
             name: "7.0 Ub-20 gcc-9 + RT-5.1 pc686"
-            # Cache dependencies key below must be changed to
-            # add builds for other RTEMS targets
 
           - os: ubuntu-20.04
             cmp: gcc
@@ -150,7 +149,7 @@ jobs:
       uses: actions/cache@v2
       with:
         path: ~/.cache
-        key: ${{ matrix.base }}/${{ matrix.os }}/${{ matrix.cmp }}/${{ matrix.configuration }}/${{ matrix.wine }}${{ matrix.rtems }}/${{ matrix.extra }}
+        key: ${{ matrix.key }}
     - name: Automatic core dump analysis
       uses: mdavidsaver/ci-core-dumper@master
     - name: "apt-get install"