ci: add instruction for running github actions locally (#218)

.github/workflows/pre-merge-rust.yml

@@ -54,6 +54,14 @@ jobs:
       with:
         path: ~/.cargo/bin
         key: ${{ runner.os }}-cargo-tools-${{ github.head_ref || github.ref_name }}-${{ hashFiles('**/Cargo.lock') }}
+    - name: Install Rust in dev environment
+      # Install Rust only to run GitHub Local Actions in (dev environment) using the `ACT` environment variable.
+      # See act usage: https://nektosact.com/introduction.html
+      # https://nektosact.com/usage/index.html?highlight=env.Act#skipping-steps
+      if: ${{ env.ACT }}
+      run: |
+        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
     - name: Set up Rust Toolchain Components
       run: rustup component add rustfmt clippy
     - name: Run Cargo Check on runtime

CONTRIBUTING.md

@@ -108,6 +108,19 @@ If a fix is implemented by a pre-commit hook, adding the file again
 and running `git commit` a second time will pass and successfully
 commit.
 
+# Running Github actions locally
+
+To run the Github actions locally, you can use the `act` tool.
+See [act usage](https://nektosact.com/introduction.html) for more information.
+
+For example, to run the pre-merge-rust workflow locally, you can use the following command from terminal:
+```
+act -j pre-merge-rust
+```
+
+Also you can use vscode extension [GitHub Local Actions](https://marketplace.visualstudio.com/items?itemName=SanjulaGanepola.github-local-actions) to run the workflows from vscode.
+
+
 # Developer Certificate of Origin
 
 Triton Distributed is an open source product released under