Initial libcnb.rs skeleton with integration test

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+
+  rust-lint:
+    runs-on: sfdc-hk-ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Update Rust toolchain
+        run: rustup update
+      - name: Rust Cache
+        uses: Swatinem/[email protected]
+      - name: Clippy
+        run: cargo clippy --all-targets --locked -- --deny warnings
+      - name: rustfmt
+        run: cargo fmt -- --check
+
+  rust-unit-test:
+    runs-on: sfdc-hk-ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Update Rust toolchain
+        run: rustup update
+      - name: Rust Cache
+        uses: Swatinem/[email protected]
+      - name: Run unit tests
+        run: cargo test --locked
+
+  rust-integration-test:
+    runs-on: sfdc-hk-ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install musl-tools
+        run: sudo apt-get install musl-tools -y --no-install-recommends
+      - name: Update Rust toolchain
+        run: rustup update
+      - name: Install Rust linux-musl target
+        run: rustup target add x86_64-unknown-linux-musl
+      - name: Rust Cache
+        uses: Swatinem/[email protected]
+      - name: Install Pack CLI
+        uses: buildpacks/github-actions/[email protected]
+      - name: Run integration tests
+        run: cargo test --locked -- --ignored --test-threads 16

.github/workflows/prepare-release.yml

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+name: Prepare Buildpack Releases
+
+on:
+  workflow_dispatch:
+    inputs:
+      bump:
+        description: "Bump"
+        required: true
+        default: 'patch'
+        type: choice
+        options:
+          - major
+          - minor
+          - patch
+
+jobs:
+  prepare-release:
+    uses: heroku/languages-github-actions/.github/workflows/_buildpacks-prepare-release.yml@latest
+    with:
+      app_id: ${{ vars.LINGUIST_GH_APP_ID }}
+      bump: ${{ inputs.bump }}
+    secrets:
+      app_private_key: ${{ secrets.LINGUIST_GH_PRIVATE_KEY }}

.github/workflows/release.yml

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+name: Release Buildpacks
+
+on:
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: Execute the release workflow but skip any steps that publish (for testing purposes)
+        type: boolean
+        default: false
+
+jobs:
+  release:
+    name: Release
+    uses: heroku/languages-github-actions/.github/workflows/_buildpacks-release.yml@latest
+    with:
+      app_id: ${{ vars.LINGUIST_GH_APP_ID }}
+      dry_run: ${{ inputs.dry_run }}
+    secrets:
+      app_private_key: ${{ secrets.LINGUIST_GH_PRIVATE_KEY }}
+      cnb_registry_token: ${{ secrets.CNB_REGISTRY_RELEASE_BOT_GITHUB_TOKEN }}
+      docker_hub_user: ${{ secrets.DOCKER_HUB_USER }}
+      docker_hub_token: ${{ secrets.DOCKER_HUB_TOKEN }}

.gitignore

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+.idea
+dist/
+node_modules/
+.tool-versions
+
+packaged/
+**/target/
+*.cnb
+
+.DS_Store