collab: Override Cargo configuration in the `Dockerfile` (#17901)

Marshall Bowers created 

This PR moves the override for the Cargo configuration for collab into
the `Dockerfile` rather than having it be something some in the external
environment.

This makes it possible to build the Docker image locally without having
to replace `.cargo/config.toml` with the contents of
`.cargo/collab-config.toml`.

Release Notes:

- N/A

Change summary

.github/workflows/deploy_collab.yml | 3 ---
Dockerfile                          | 3 +++
2 files changed, 3 insertions(+), 3 deletions(-)

Detailed changes

.github/workflows/deploy_collab.yml 🔗 

@@ -75,9 +75,6 @@ jobs:
         with:
           clean: false
 
-      - name: Set up default .cargo/config.toml
-        run: cp ./.cargo/collab-config.toml ./.cargo/config.toml
-
       - name: Build docker image
         run: docker build . --build-arg GITHUB_SHA=$GITHUB_SHA --tag registry.digitalocean.com/zed/collab:$GITHUB_SHA

Dockerfile 🔗 

@@ -4,6 +4,9 @@ FROM rust:1.81-bookworm as builder
 WORKDIR app
 COPY . .
 
+# Replace the Cargo configuration with the one used by collab.
+COPY ./.cargo/collab-config.toml ./.cargo/config.toml
+
 # Compile collab server
 ARG CARGO_PROFILE_RELEASE_PANIC=abort
 ARG GITHUB_SHA