Replace heroku/nodejs-engine with libcnb.rs implementation

.circleci/config.yml

@@ -18,9 +18,19 @@ orbs:
       install-build-dependencies:
         steps:
           - run:
-              name: "Install rsync, jq via apt"
-              command: sudo apt-get update && sudo apt-get install -y rsync jq
+              name: "Install rsync, jq, and musl-tools via apt"
+              command: sudo apt-get update && sudo apt-get install -y --no-install-recommends rsync jq musl-tools
           - install-yq
+      install-rust-toolchain:
+        steps:
+          - run:
+              name: "Install rustc stable"
+              command: |
+                curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y -t x86_64-unknown-linux-musl
+                echo "export PATH=\"$HOME/.cargo/bin:$PATH\"" >> $BASH_ENV
+          - run:
+              name: "Install libcnb-cargo"
+              command: cargo install libcnb-cargo
 
 jobs:
   package-buildpack:
@@ -33,8 +43,9 @@ jobs:
       - checkout
       - setup_remote_docker
       - pack/install-pack:
-          version: 0.23.0
+          version: 0.24.0
       - heroku-buildpacks/install-build-dependencies
+      - heroku-buildpacks/install-rust-toolchain
       - run:
           name: "Build and package buildpack with retries"
           command: |
@@ -61,9 +72,10 @@ jobs:
     steps:
       - checkout
       - pack/install-pack:
-          version: 0.23.0
+          version: 0.24.0
       - ruby/install-deps
       - heroku-buildpacks/install-build-dependencies
+      - heroku-buildpacks/install-rust-toolchain
       - run:
           name: "Run rspec tests against a given directory"
           command: |
@@ -110,16 +122,50 @@ jobs:
           name: Shpec unit tests on heroku-<<parameters.stack-version>>
           command: shpec << parameters.buildpack-dir >>/shpec/*_shpec.sh
 
+  rust-integration-test:
+    machine:
+      image: ubuntu-2004:202201-02
+    steps:
+      - checkout
+      - pack/install-pack:
+          version: 0.24.0
+      - heroku-buildpacks/install-build-dependencies
+      - heroku-buildpacks/install-rust-toolchain
+      - run:
+          command: cargo test --locked -- --ignored
+
+  rust-unit-test:
+    docker:
+      - image: cimg/rust:1.59
+    steps:
+      - checkout
+      - run:
+          command: cargo test --locked
+
+  rust-linting:
+    docker:
+      - image: cimg/rust:1.59
+    steps:
+      - checkout
+      - run:
+          name: rustfmt
+          command: cargo fmt -- --check --verbose
+      - run:
+          name: clippy
+          command: cargo clippy --all-targets --all-features --locked -- --deny warnings
+
 workflows:
   version: 2
   ci:
     jobs:
       - shell-linting
+      - rust-linting
+      - rust-unit-test
+      - rust-integration-test
       - shpec:
           matrix:
             parameters:
               buildpack-dir:
-                - "buildpacks/nodejs-engine"
                 - "buildpacks/nodejs-function-invoker"
                 - "buildpacks/npm"
               stack-version:

.gitignore

@@ -2,6 +2,7 @@
 dist/
 node_modules/
 package-lock.json
+.tool-versions
 
 **/target/