CI : Build targets together and rename artifact

The "install toolchain" step is very slow, and needed to run for each
target part of the build matrix. There is no obvious way to "cache" the
runner environment just before running cmake. Uploading artifacts
separately may be possible but I couldn't find how to do that with a
build matrix or arrays/maps.

Weekly builds, or push/ pullrequest triggered builds, now generate different
names.

.github/workflows/ci.yml

@@ -15,16 +15,6 @@ env:
 jobs:
   build:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        target:
-          - "cantact"
-          - "canalyze"
-          - "canable"
-          - "usb2can"
-          - "cannette"
-          - "candleLight"
-          - "STM32F4_DevBoard"
 
     steps:
     - uses: actions/checkout@v2
@@ -43,15 +33,27 @@ jobs:
         MAKEFLAGS: "-j"
       run: |
         cmake --build ${{github.workspace}}/build \
-              --config ${{env.BUILD_TYPE}} \
-              --target ${{matrix.target}}_fw
+              --config ${{env.BUILD_TYPE}}
 
     - name: Get current date
       id: date
       run: echo "::set-output name=date::$(date +'%Y%m%d')"
+      
+    - name: generate short hash
+      id: vars
+      run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
 
-    - name: Upload Build Artifacts
+    - name: Upload weekly build
       uses: actions/upload-artifact@v2.3.1
+      #only run step if event type was "schedule"
+      if: github.event.schedule
       with:
-        name: ${{matrix.target}}_${{steps.date.outputs.date}}_firmware
+        name: weekly_${{steps.date.outputs.date}}_${{steps.vars.outputs.sha_short}}
         path: ${{github.workspace}}/build/${{matrix.target}}_fw.bin
+
+    - name: Upload dev snapshot
+      uses: actions/upload-artifact@v2.3.1
+      if: ${{ github.event_name != 'schedule'}}
+      with:
+        name: build_${{steps.date.outputs.date}}_${{steps.vars.outputs.sha_short}}
+        path: ${{github.workspace}}/build/*_fw.bin