Attempt to run workers in separator jobs

.github/workflows/ci.yml

@@ -68,6 +68,44 @@ jobs:
     - name: Test
       run: ./scripts/run-tests-on-maelstrom.sh "${{ env.ACTIONS_RUNTIME_TOKEN }}" "${{ env.ACTIONS_RESULTS_URL }}"
 
+  run_worker:
+    strategy:
+      matrix:
+        worker_number: [1, 2, 3, 4, 5, 6]
+    name: Run Worker
+    runs-on: ubuntu-24.04
+    steps:
+    - name: Get Repository from Git
+      uses: actions/checkout@v4
+    - name: Install Nix
+      uses: DeterminateSystems/nix-installer-action@main
+    - name: Set up Nix Cache
+      uses: DeterminateSystems/magic-nix-cache-action@main
+    # For some reason, GitHub provides Rust for us. The problem is that, when
+    # executing the recursive cargo invocation, the cargo in ~/.cargo/bin ends
+    # up prepended to PATH, which then causes problems.
+    - name: Remove Rust provided by GitHub.
+      run: rm -rf ~/.cargo/bin ~/.rustup
+    - name: Disable apparmor container restrictions
+      run: sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
+    - name: Install Nix Flake
+      run: nix develop --command echo done
+    - name: Get Rust version
+      run: echo "RUST_VERSION=$(nix develop --command rustc --version | cut -d' ' -f2)" >> $GITHUB_ENV
+    - name: Set up Rust Cache
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+          target/
+        key: maelstrom-${{ hashFiles('Cargo.lock', 'flake.lock') }}-${{ env.RUST_VERSION }}
+    - name: Expose GitHub Action Runtime
+      uses: crazy-max/ghaction-github-runtime@v3
+    - name: Run Worker
+      run: ./scripts/run-worker.sh "${{ env.ACTIONS_RUNTIME_TOKEN }}" "${{ env.ACTIONS_RESULTS_URL }}"
+
   github_api_tests:
     strategy:
       matrix:

scripts/run-tests-on-maelstrom-inner.sh

@@ -9,12 +9,13 @@ BROKER_ARGS=""
 WORKER_ARGS=""
 CARGO_ARGS="--profile=release"
 PYTEST_ARGS=""
+START_WORKER=1
 
 if [[ $# -gt 0 ]]; then
     export ACTIONS_RUNTIME_TOKEN=$1
     export ACTIONS_RESULTS_URL=$2
     BROKER_ARGS="$BROKER_ARGS --artifact-transfer-strategy github"
-    WORKER_ARGS="$WORKER_ARGS --artifact-transfer-strategy github --broker-connection github"
+    START_WORKER=0
     CARGO_ARGS="$CARGO_ARGS --artifact-transfer-strategy github"
     PYTEST_ARGS="$PYTEST_ARGS --artifact-transfer-strategy github"
     echo "using github for artifact transfer"
@@ -30,7 +31,9 @@ PORT=$( \
 	| awk '/\<addr: / { print $0; exit}' \
 	| sed -Ee 's/^.*\baddr: [^,]*:([0-9]+),.*$/\1/' \
 )
-cargo run --release --bin maelstrom-worker -- --broker=localhost:$PORT $WORKER_ARGS &
+if [[ $START_WORKER -gt 0 ]]; then
+    cargo run --release --bin maelstrom-worker -- --broker=localhost:$PORT $WORKER_ARGS &
+fi
 
 cargo run --release --bin cargo-maelstrom -- --broker=localhost:$PORT $CARGO_ARGS
 CARGO_MAELSTROM_STATUS=$?

scripts/run-worker-inner.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -ex
+
+export ACTIONS_RUNTIME_TOKEN=$1
+export ACTIONS_RESULTS_URL=$2
+WORKER_ARGS="--artifact-transfer-strategy github --broker-connection github"
+
+cargo run --release --bin maelstrom-worker -- --broker=0.0.0.0:0 $WORKER_ARGS &

scripts/run-worker.sh

@@ -0,0 +1 @@
+wrapper.sh