Move custom musl build instructions under generic cargo-dist configs.

.github/musl-build-setup.yml

@@ -1,3 +1,4 @@
-- run: |
-  sudo apt-get install -y pkg-config libssl-dev musl musl-dev musl-tools
-  rustup target add x86_64-unknown-linux-musl
+- if: ${{ runner.os == 'Linux' }}
+  run: |
+    sudo apt-get install -y pkg-config libssl-dev musl musl-dev musl-tools
+    rustup target add x86_64-unknown-linux-musl

Cargo.toml

@@ -39,6 +39,15 @@ install-updater = false
 install-path = "~/.aiken/bin"
 # Whether to publish prereleases to package managers
 publish-prereleases = true
+# Inject build steps into the build-local-artifacts job to prepare the container.
+# This is needed to install libssl-dev and musl tools for producing statically linked
+# binary on Linux and avoid weird segfaults.
+#
+# Note: should be a path relative to the .github/workflows/ directory, and
+# which should point to a .yml file containing the github workflow steps just
+# as one would normally write them in a workflow.
+[workspace.metadata.dist]
+github-build-setup = "../musl-build-setup.yml"
 
 [[workspace.metadata.dist.artifact]]
 target = "x86_64-unknown-linux-musl"
@@ -49,16 +58,6 @@ features = ["bundle_openssl"]
 [workspace.metadata.dist.github-custom-runners]
 x86_64-unknown-linux-musl = "ubuntu-22.04"
 
-# Inject build steps into the build-local-artifacts job to prepare the container.
-# This is needed to install libssl-dev and musl tools for producing statically linked
-# binary on Linux and avoid weird segfaults.
-#
-# Note: should be a path relative to the .github/workflows/ directory, and
-# which should point to a .yml file containing the github workflow steps just
-# as one would normally write them in a workflow.
-[workspace.metadata.dist.github-build-setup]
-x86_64-unknown-linux-musl = "../musl-build-setup.yml"
-
 [workspace.dependencies]
 walkdir = "2.3.2"
 insta = { version = "1.30.0", features = ["yaml", "json", "redactions"] }