ci: add xcp (parallel cp) to builder image

.woodpecker/image-builder.yml

@@ -86,3 +86,4 @@ steps:
       tags:
         - ${VERSION}
       dockerfile: Dockerfile.builder
+

Makefile

@@ -24,7 +24,7 @@ test: build
 fmt:
 	cargo +nightly fmt
 	stylua --config-path stylua.toml .
-	black docs/generate-toc.py assets/ci/build-builder-images.py assets/bt
+	black docs/generate-toc.py assets/ci/build-builder-images.py assets/ci/emit-builder-dockerfile.py assets/bt
 
 sink: unsink
 	sudo iptables -t nat -A OUTPUT -p tcp \! -d 192.168.1.0/24 --dport 25 -j DNAT --to-destination 127.0.0.1:2026

assets/ci/emit-builder-dockerfile.py

@@ -35,6 +35,7 @@ commands = [
     "/tmp/get-deps.sh",
     f"curl -LsSf {NEXTEST} | tar zxf - -C /usr/local/bin",
     "cargo install --locked sccache --no-default-features",
+    "cargo install --locked xcp",
 ]
 
 if "ubuntu" in container: