ci: build all targets in custom build tests

Add --all-targets flag to all custom build test commands to ensure
benchmarks, tests, and examples are compiled in addition to the library.

Signed-off-by: pizzacat83 <[email protected]>

Author: pizzacat83

.buildkite/custom-tests.json

@@ -2,21 +2,21 @@
     "tests": [
         {
             "test_name": "build-gnu-bzimage",
-            "command": "cargo build --release --features bzimage",
+            "command": "cargo build --release --features bzimage --all-targets",
             "platform": [
                 "x86_64"
             ]
         },
         {
             "test_name": "build-musl-bzimage",
-            "command": "cargo build --release --features bzimage --target {target_platform}-unknown-linux-musl",
+            "command": "cargo build --release --features bzimage --target {target_platform}-unknown-linux-musl --all-targets",
             "platform": [
                 "x86_64"
             ]
         },
         {
             "test_name": "build-no-default-features",
-            "command": "cargo build --release --no-default-features",
+            "command": "cargo build --release --no-default-features --all-targets",
             "platform": [
                 "x86_64",
                 "aarch64"