ci: drop build and unittest steps from custom-tests.json

Now that the normal CI does cargo all-features [test|build], there is no
longer a need to have separate buildkite steps just for the xen-disabled
usecase.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

.buildkite/custom-tests.json

@@ -1,61 +1,17 @@
 {
   "tests": [
-    {
-      "test_name": "build-gnu-mmap",
-      "command": "cargo build --release --features=xen",
-      "platform": ["x86_64", "aarch64"]
-    },
-    {
-      "test_name": "build-gnu-mmap-no-xen",
-      "command": "cargo build --release --features=backend-mmap",
-      "platform": ["x86_64", "aarch64"]
-    },
-    {
-      "test_name": "build-musl-mmap",
-      "command": "cargo build --release --features=xen --target {target_platform}-unknown-linux-musl",
-      "platform": ["x86_64", "aarch64"]
-    },
-    {
-      "test_name": "build-musl-mmap-no-xen",
-      "command": "cargo build --release --features=backend-mmap --target {target_platform}-unknown-linux-musl",
-      "platform": ["x86_64", "aarch64"]
-    },
     {
       "test_name": "miri",
       "command": "RUST_BACKTRACE=1 MIRIFLAGS='-Zmiri-disable-isolation -Zmiri-backtrace=full' cargo +nightly miri test --features backend-mmap,backend-bitmap",
       "platform": ["x86_64", "aarch64"]
     },
-    {
-      "test_name": "unittests-gnu-no-xen",
-      "command": "cargo test --features 'backend-bitmap backend-mmap backend-atomic' --workspace",
-      "platform": [
-        "x86_64",
-        "aarch64"
-      ]
-    },
-    {
-      "test_name": "unittests-musl-no-xen",
-      "command": "cargo test  --features 'backend-bitmap backend-mmap backend-atomic' --workspace --target {target_platform}-unknown-linux-musl",
-      "platform": [
-        "x86_64",
-        "aarch64"
-      ]
-    },
     {
       "test_name": "clippy-no-xen",
       "command": "cargo clippy --workspace --bins --examples --benches  --features 'backend-bitmap backend-mmap backend-atomic' --all-targets -- -D warnings -D clippy::undocumented_unsafe_blocks",
       "platform": [
         "x86_64",
         "aarch64"
       ]
-    },
-    {
-      "test_name": "check-warnings-no-xen",
-      "command": "RUSTFLAGS=\"-D warnings\" cargo check --all-targets  --features 'backend-bitmap backend-mmap backend-atomic' --workspace",
-      "platform": [
-        "x86_64",
-        "aarch64"
-      ]
     }
   ]
 }