Properly wait for things that are spawned as bg processes (#4408)

## Motivation

Right now we have a lot of stuff in CI that gets started as a bg
process. However, the issue is that if these things start taking
slightly longer to start up for some reason, it'll make the test fail,
because the test will try to submig requests to something that isn't
ready yet.

## Proposal

Explicitly wait for things to be actually up before proceeding.

## Test Plan

CI

## Release Plan

- Nothing to do / These changes follow the usual release cycle.

Author: ndr-ds

.github/workflows/rust.yml

@@ -71,18 +71,25 @@ jobs:
     - name: Run the storage-service instance
       run: |
         cargo run --release -p linera-storage-service -- memory --endpoint $LINERA_STORAGE_SERVICE &
+    - name: Wait for storage service to be ready
+      run: |
+        until nc -z 127.0.0.1 1235; do sleep 1; done
+    - name: Build binaries
+      run: |
+        cargo build --features storage-service --bin linera-server --bin linera-proxy --bin linera
     - name: Run the validators
       run: |
-        cargo build --features storage-service
         mkdir /tmp/local-linera-net
-        cargo run --features storage-service --bin linera -- net up --storage service:tcp:$LINERA_STORAGE_SERVICE:table --policy-config testnet --path /tmp/local-linera-net --validators 4 --shards 4 &
+        cargo run --features storage-service --bin linera -- net up --storage service:tcp:$LINERA_STORAGE_SERVICE:table --policy-config testnet --path /tmp/local-linera-net --validators 2 --shards 2 &
     - name: Create two epochs and run the faucet
       # See https://github.com/linera-io/linera-protocol/pull/2835 for details.
       run: |
-        cargo build --bin linera
         cargo run --bin linera -- resource-control-policy --http-request-timeout-ms 1000
         cargo run --bin linera -- resource-control-policy --http-request-timeout-ms 500
         cargo run --bin linera -- faucet --amount 1000 --port 8079 &
+    - name: Wait for faucet to be ready
+      run: |
+        until curl -s http://localhost:8079 >/dev/null; do sleep 1; done
     - name: Run the remote-net tests
       run: |
         cargo test -p linera-service remote_net_grpc --features remote-net
@@ -193,6 +200,9 @@ jobs:
     - name: Run the storage-service instance
       run: |
         cargo run --release -p linera-storage-service -- memory --endpoint $LINERA_STORAGE_SERVICE &
+    - name: Wait for storage service to be ready
+      run: |
+        until nc -z 127.0.0.1 1235; do sleep 1; done
     - name: Run the benchmark test
       run: |
         cargo build --locked -p linera-service --bin linera-benchmark --features storage-service
@@ -250,6 +260,9 @@ jobs:
     - name: Run the storage-service instance
       run: |
         cargo run --release -p linera-storage-service -- memory --endpoint $LINERA_STORAGE_SERVICE &
+    - name: Wait for storage service to be ready
+      run: |
+        until nc -z 127.0.0.1 1235; do sleep 1; done
     - name: Run Ethereum tests
       run: |
         cargo test -p linera-ethereum --features ethereum
@@ -274,9 +287,14 @@ jobs:
       run: |
         cd examples
         cargo build --locked --release --target wasm32-unknown-unknown
-    - name: Run the storage-service instance and the storage-service tests
+    - name: Run the storage-service instance
       run: |
         cargo run --release -p linera-storage-service -- memory --endpoint $LINERA_STORAGE_SERVICE &
+    - name: Wait for storage service to be ready
+      run: |
+        until nc -z 127.0.0.1 1235; do sleep 1; done
+    - name: Run the storage-service tests
+      run: |
         cargo test --features storage-service -- storage_service --nocapture
 
   web: