ci: Simplify the VM jobs

There's no need to run `cargo xtask build` first, since the build happens anyway
when calling `cargo xtask run`.

Author: nicholasbishop

.github/workflows/rust.yml

@@ -25,9 +25,6 @@ jobs:
         sudo apt-get update
         sudo apt-get install qemu-system-arm qemu-efi-aarch64 -y
 
-    - name: Build
-      run: cargo xtask build --target aarch64
-
     - name: Run VM tests
       run: cargo xtask run --target aarch64 --headless --ci
       timeout-minutes: 2
@@ -44,9 +41,6 @@ jobs:
         sudo apt-get update
         sudo apt-get install qemu-system-x86 ovmf swtpm -y
 
-    - name: Build (without unstable)
-      run: cargo xtask build --target x86_64
-
     - name: Run VM tests
       run: cargo xtask run --target x86_64 --headless --ci --tpm=v1
       timeout-minutes: 2
@@ -63,9 +57,6 @@ jobs:
         sudo apt-get update
         sudo apt-get install qemu-system-x86 ovmf-ia32 swtpm -y
 
-    - name: Build
-      run: cargo xtask build --target ia32
-
     - name: Run VM tests
       run: cargo xtask run --target ia32 --headless --ci --tpm=v2
       timeout-minutes: 2
@@ -147,9 +138,6 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v3
 
-      - name: Build
-        run: cargo xtask build
-
       - name: Run VM tests
         run: cargo xtask run --target x86_64 --ci
         timeout-minutes: 2