ci: Add raspberrypi-armv7 to the build matrix

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

.github/workflows/yocto-builds.yml

@@ -27,6 +27,7 @@ jobs:
           - raspberrypi4
           - raspberrypi-cm3
           - raspberrypi-cm
+          - raspberrypi-armv7
         image: [rpi-test-image]
         distro: [poky]
     runs-on: [self-hosted, Linux]