feat(migration-tool): Placeholder for the Oisy data migration tool

.github/workflows/cli-tests.yml

@@ -0,0 +1,40 @@
+name: Backend Checks
+
+on:
+  pull_request:
+    paths:
+      - # Scripts, GitHub actions that contain 'backend' in their path.
+        '**/*backend*'
+      - # The backend source code
+        'src/backend/**'
+      - 'src/shared/**'
+      - # Rust files such as Cargo.lock, Cargo.toml and rust-toolchain.toml
+        '**/Cargo*'
+      - '**/*rust*'
+      - # The dockerfile used in this CI run, and the scripts it COPY's.
+        'Dockerfile'
+      - 'docker/**'
+  workflow_dispatch:
+
+jobs:
+
+  hello-world:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-backend-tests-${{ hashFiles('Cargo.lock', 'rust-toolchain.toml') }}
+      - name: Print hello world
+        run: cargo run --bin oisy
+
+  may-merge:
+    needs: [ 'hello-world' ]
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Cleared for merging
+        run: echo OK

Cargo.toml

@@ -1,6 +1,7 @@
 [workspace]
 members = [
     "src/backend",
+    "src/oisy",
     "src/shared"
 ]
 resolver = "2"

src/oisy/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "oisy"
+version = "0.1.0"
+edition = "2021"
+description = "CLI tool for managing Oisy"
+
+[dependencies]

src/oisy/README.md

@@ -0,0 +1,15 @@
+# `oisy` CLI
+
+This is a tool used to move state from one Oisy instance to another.
+
+## How it works
+
+This tool:
+
+- Configures both source and destination canisters to stop receiving writes.
+- Verifies that the destination is empty.
+- Copies all the data from the source canister to the destination canister.
+- Checks the data transfer.
+- Enables writes on the destination canister.
+
+Utilities are also provided to check the state of both canisters.

src/oisy/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}