Replace init.sh script with proper rust-toolchain file.

.github/workflows/docs.yml

@@ -14,13 +14,10 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v1
 
-      - uses: actions-rs/toolchain@v1
-        with:
-          target: wasm32-unknown-unknown
-          # Toolchain is autodetected from `rust-toolchain` file
-          # https://github.com/actions-rs/toolchain#the-toolchain-file
-          #toolchain: ${{ env.WASM_BUILD_TOOLCHAIN }}
-          default: true
+      # With rustup's nice new toml format, we just need to run rustup show to install the toolchain
+      # https://github.com/actions-rs/toolchain/issues/126#issuecomment-782989659
+      - name: Setup Rust toolchain
+        run: rustup show
 
       - uses: actions/cache@v2
         with:

.github/workflows/release.yml

@@ -127,13 +127,12 @@ jobs:
         with:
           path: ${{ runner.tool_cache }}/cargo-sccache
           key: ${{ runner.OS }}-sccache-bin-${{ env.CARGO_SCCACHE_VERSION }}-v1
-      - uses: actions-rs/toolchain@v1
-        with:
-          target: wasm32-unknown-unknown
-          # Toolchain is autodetected from `rust-toolchain` file
-          # https://github.com/actions-rs/toolchain#the-toolchain-file
-          #toolchain: ${{ env.WASM_BUILD_TOOLCHAIN }}
-          default: true
+
+      # With rustup's nice new toml format, we just need to run rustup show to install the toolchain
+      # https://github.com/actions-rs/toolchain/issues/126#issuecomment-782989659
+      - name: Setup Rust toolchain
+        run: rustup show
+
       - name: Install sccache
         run: |
           if [ ! -f ${{ runner.tool_cache }}/cargo-sccache/bin/sccache ]; then

README.md

@@ -93,9 +93,6 @@ need a refresher setting up your Substrate environment, see [Substrate's Getting
 git clone https://github.com/PureStake/moonbeam
 cd moonbeam
 
-# Optional: Ensure you have the exact nightly toolchain used by Moonbeam's CI
-./scripts/init.sh
-
 # Build the node (The first build will be long (~30min))
 cargo build --release
 ```

docker/polkadot-relay.Dockerfile

@@ -27,7 +27,6 @@ RUN sed -i '/sc_executor::WasmExecutionMethod::Interpreted/c\\t\tsc_executor::Wa
 # Download rust dependencies and build the rust binary
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y && \
 	export PATH=$PATH:$HOME/.cargo/bin && \
-	scripts/init.sh && \
 	cargo build --$PROFILE --features=real-overseer
 
 # ===== SECOND STAGE ======

rust-toolchain

@@ -1 +1,5 @@
-nightly-2021-01-13
+[toolchain]
+channel = "nightly-2021-01-13"
+components = [ "rustfmt", "clippy" ]
+targets = [ "wasm32-unknown-unknown" ]
+profile = "minimal"