[APMSVLS-501] feat(bottlecap): add bottlecap-test-mode binary

.github/workflows/rs_ci.yml

@@ -82,8 +82,8 @@ jobs:
         run: cargo clippy --workspace --all-targets --features default
       - working-directory: bottlecap
         run: cargo clippy --workspace --all-targets --no-default-features --features fips
-      # No other job compiles the test-mode feature: it gates test-only
-      # constructors that are absent from default and fips builds.
+      # The test-mode feature gates the bottlecap-test-mode binary via
+      # required-features, so no other job compiles it.
       - working-directory: bottlecap
         run: cargo clippy --workspace --all-targets --features default,test-mode
 

.gitlab/templates/pipeline.yaml.tpl

@@ -63,8 +63,8 @@ cargo clippy:
     # We need to do these separately because the fips feature is incompatible with the default feature.
     - cargo clippy --workspace --features default
     - cargo clippy --workspace --no-default-features --features fips
-    # No other job compiles the test-mode feature: it gates test-only
-    # constructors that are absent from default and fips builds.
+    # The test-mode feature gates the bottlecap-test-mode binary via
+    # required-features, so no other job compiles it.
     - cargo clippy --workspace --features default,test-mode
 
 {{ range $flavor := (ds "flavors").flavors }}

bottlecap/Cargo.toml

@@ -117,6 +117,10 @@ flate2 = { version = "1.1", default-features = false, features = ["rust_backend"
 [[bin]]
 name = "bottlecap"
 
+[[bin]]
+name = "bottlecap-test-mode"
+required-features = ["test-mode"]
+
 [profile.dev]
 debug = true   # same as debuginfo=2 and no stripping
 strip = false
@@ -178,8 +182,10 @@ fips = [
 # `InvocationProcessorHandle::noop()`) to callers that need to drive the
 # trace-processing surface without Lambda lifecycle state.
 # Not enabled in `default` or `fips`, so the items it gates do not appear
-# in production builds.
-test-mode = []
+# in production builds. `tokio/signal` is pulled in here rather than in the
+# base dependency so the shipped extension does not carry the signal driver
+# for a binary only the test-mode build produces.
+test-mode = ["tokio/signal"]
 
 [lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(coverage,coverage_nightly)'] }