CI: Clean up the work the CI build does

Add -M full to the twister build so that it cleans up space as it goes.
This should allow the build to run to completion.

Add -j4 to the build. Although the CI images currently have 4 cpus, this
will help protect us against future ones that have more.

Give twister an explicit list of platforms.  This fixes two issues.  One
is that the output is getting flooded with messages about skipped tests.
The other is this allows us to add platforms that qemu seems to be
ignoring entirely.

Signed-off-by: David Brown <[email protected]>

.github/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          path: zephyr-rust-lang
+          path: apptest
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -36,7 +36,7 @@ jobs:
       - name: Setup Zephyr project
         uses: zephyrproject-rtos/action-zephyr-setup@v1
         with:
-          app-path: zephyr-rust-lang
+          app-path: apptest
           manifest-file-name: ci-manifest.yml
           toolchains: arm-zephyr-eabi:riscv64-zephyr-elf
 
@@ -51,9 +51,13 @@ jobs:
           rustup target add thumbv8m.main-none-eabi
 
       - name: Build firmware
-        working-directory: zephyr-rust-lang
+        working-directory: apptest
         shell: bash
         run: |
           cargo --version
 
-          west twister -T samples -T tests -v --inline-logs --integration
+          lscpu
+          df -h
+
+          west twister -M all -T samples -T tests -v --inline-logs --integration -j 4
+             $(cat etc/platforms.txt)

etc/platforms.txt

@@ -0,0 +1,8 @@
+-p mps2/an385
+-p mps2/an521/cpu0
+-p qemu_cortex_m0
+-p qemu_cortex_m3
+-p qemu_riscv32
+-p qemu_riscv32/qemu_virt_riscv32/smp
+-p qemu_riscv64
+-p qemu_riscv64/qemu_virt_riscv64/smp