Add Dockerfile template for Rust

changelogs/unreleased/28167-dockerfile-template-rust.yml

+---
+title: "Add Rust Dockerfile to GitLab templates"
+merge_request: 28167
+author:
+type: added

doc/api/templates/dockerfiles.md

@@ -92,6 +92,10 @@ Example response:
     "key": "Ruby-alpine",
     "name": "Ruby-alpine"
   },
+  {
+    "key": "Rust",
+    "name": "Rust"
+  },
   {
     "key": "Swift",
     "name": "Swift"

vendor/Dockerfile/Rust.Dockerfile

+FROM rust:1.45 as builder
+
+WORKDIR /usr/src/app
+
+COPY . .
+RUN cargo build --release
+
+FROM debian:buster-slim
+
+COPY --from=builder /usr/src/app/target/release/app .
+
+EXPOSE 8080
+CMD ["./app"]