Single point of control on rust version

.github/workflows/build.yml

@@ -5,6 +5,9 @@ on:
   pull_request:
   workflow_dispatch:
 
+env:
+  rust_version: "1.84.0"
+
 jobs:
   pre_job:
     # continue-on-error: true # Uncomment once integration is finished
@@ -178,7 +181,7 @@ jobs:
           echo "${HOME}/.cargo/bin" >> "${GITHUB_PATH}"
       - name: Install ${{ matrix.arch }} Rust toolchain
         run: |
-          rustup default 1.84.0
+          rustup default "${{ env.rust_version }}"
           rustup target add ${TARGET}
         env:
           TARGET: ${{ matrix.target }}
@@ -285,7 +288,7 @@ jobs:
           REPO_NAME: ${{ steps.docker_repo.outputs.DOCKER_NWO }}
       - name: Install rust
         run: |
-          rustup default 1.84.0
+          rustup default "${{ env.rust_version }}"
           rustup toolchain install stable
       - name: Install toml-cli
         run: |
@@ -345,7 +348,7 @@ jobs:
         uses: actions/checkout@v4
       - name: Install rust
         run: |
-          rustup default 1.84.0
+          rustup default "${{ env.rust_version }}"
           rustup toolchain install stable
       - name: Install toml-cli
         run: |