Improve docker image for RBE and re-enable RBE on main (TraceMachina#1326)

Author: bclark8923

.github/workflows/main.yml

@@ -20,15 +20,14 @@ jobs:
     runs-on: ubuntu-22.04
     environment: production
     name: NativeLink.com Cloud / RBE on Main (Legacy Dockerfile Test)
-    if: false
-    # github.ref == 'refs/heads/main'
+    if: github.ref == 'refs/heads/main'
     steps:
     - name: Checkout
       uses: >- # v4.1.1
         actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
 
     - name: Set up AWS CLI
-      uses: aws-actions/configure-aws-credentials@v1
+      uses: aws-actions/configure-aws-credentials@e3dd6a429d7300a6a4c196c26e071d42e0343502
       with:
         aws-access-key-id: ${{ secrets.RBE_ECR_AWS_ACCESS_KEY_ID }}
         aws-secret-access-key: ${{ secrets.RBE_ECR_AWS_SECRET_ACCESS_KEY }}
@@ -51,8 +50,9 @@ jobs:
 
     - name: Run Bazel tests
       shell: bash
+      # remove digest_function when #1325 is resolved
       run: |
-        bazel test \
+        bazel --digest_function=sha256 test \
           --remote_cache=grpcs://cas-tracemachina-shared.build-faster.nativelink.net \
           --remote_header=x-nativelink-api-key=${{ secrets.NATIVELINK_COM_API_HEADER }} \
           --remote_instance_name=main \

tools/toolchain-nativelink/Dockerfile

@@ -30,6 +30,6 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install --no-instal
     && rm -rf /var/lib/apt/lists/*
 
 # Get Rust
-RUN curl --proto "=https" --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.79.0
+RUN curl --proto "=https" --tlsv1.2 -sSf https://raw.githubusercontent.com/rust-lang/rustup/54dd3d00fd20e64dc522517a0d7be4285570a2f1/rustup-init.sh | sh -s -- -y --default-toolchain=1.79.0
 
 RUN echo "source \"$HOME/.cargo/env\"" >> "$HOME/.bashrc"