Add vetKD system API demo

.github/workflows/rust-vetkd-example.yml

@@ -0,0 +1,39 @@
+name: rust-vetkd
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    paths:
+      - rust/vetkd/**
+      - .github/workflows/provision-darwin.sh
+      - .github/workflows/provision-linux.sh
+      - .github/workflows/rust-vetkd-example.yml
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  rust-vetkd-darwin:
+    runs-on: macos-12
+    steps:
+      - uses: actions/checkout@v1
+      - name: Provision Darwin
+        run: bash .github/workflows/provision-darwin.sh
+      - name: Rust vetKD Darwin
+        run: |
+          dfx start --background
+          pushd rust/vetkd
+          make test
+          popd
+  rust-vetkd-linux:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v1
+      - name: Provision Linux
+        run: bash .github/workflows/provision-linux.sh
+      - name: Rust vetKD Linux
+        run: |
+          dfx start --background
+          pushd rust/vetkd
+          make test
+          popd

.github/workflows/rust-vetkd-skip.yml

@@ -0,0 +1,16 @@
+name: rust-vetkd
+on:
+  pull_request:
+    paths-ignore:
+      - rust/vetkd/**
+      - .github/workflows/provision-darwin.sh
+      - .github/workflows/provision-linux.sh
+      - .github/workflows/rust-vetkd-example.yml
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo 'Not needed - relevant folder not touched'

rust/vetkd/.gitignore

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+# Various IDEs and Editors
+.vscode/
+.idea/
+**/*~
+
+# Mac OSX temporary files
+.DS_Store
+**/.DS_Store
+
+# dfx temporary files
+.dfx/
+
+# rust
+target/
+
+# generated files
+src/declarations/
+
+# frontend code
+node_modules/
+dist/
+
+# environment variables
+.env