CI: enable captured tracing output on TRACE level

Now, iff a test fails in the CI, all its logs are preserved and
available for further investigation.

Author: wprzytula

.github/workflows/authenticate_test.yml

@@ -28,4 +28,4 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Run tests
-      run: cargo test --verbose authenticate_superuser -- custom_authentication --ignored
+      run: RUST_LOG=trace cargo test --verbose authenticate_superuser -- custom_authentication --ignored

.github/workflows/cassandra.yml

@@ -29,7 +29,7 @@ jobs:
       run: cargo build --verbose --tests --features "full-serialization"
     - name: Run tests on cassandra
       run: |
-        CDC='disabled' SCYLLA_URI=172.42.0.2:9042 SCYLLA_URI2=172.42.0.3:9042 SCYLLA_URI3=172.42.0.4:9042 cargo test --verbose --features "full-serialization" -- --skip test_views_in_schema_info --skip test_large_batch_statements
+        CDC='disabled' RUST_LOG=trace SCYLLA_URI=172.42.0.2:9042 SCYLLA_URI2=172.42.0.3:9042 SCYLLA_URI3=172.42.0.4:9042 cargo test --verbose --features "full-serialization" -- --skip test_views_in_schema_info --skip test_large_batch_statements
     - name: Stop the cluster
       if: ${{ always() }}
       run: docker compose -f test/cluster/cassandra/docker-compose.yml stop

.github/workflows/rust.yml

@@ -53,7 +53,7 @@ jobs:
     - name: Run tests
       run: |
         cargo clean
-        SCYLLA_URI=172.42.0.2:9042 SCYLLA_URI2=172.42.0.3:9042 SCYLLA_URI3=172.42.0.4:9042 cargo test --verbose --features "full-serialization"
+        RUST_LOG=trace SCYLLA_URI=172.42.0.2:9042 SCYLLA_URI2=172.42.0.3:9042 SCYLLA_URI3=172.42.0.4:9042 cargo test --verbose --features "full-serialization"
     - name: Stop the cluster
       if: ${{ always() }}
       run: docker compose -f test/cluster/docker-compose.yml stop

.github/workflows/serverless.yaml

@@ -35,7 +35,7 @@ jobs:
       - name: Run cloud example
         run: cargo run --example cloud -- $HOME/.ccm/serverless/config_data.yaml
       - name: Run cloud tests
-        run: CLOUD_CONFIG_PATH=$HOME/.ccm/serverless/config_data.yaml RUSTFLAGS="--cfg scylla_cloud_tests" cargo test --verbose
+        run: CLOUD_CONFIG_PATH=$HOME/.ccm/serverless/config_data.yaml RUSTFLAGS="--cfg scylla_cloud_tests" RUST_LOG=trace cargo test --verbose
 
       - name: Remove serverless cluster
         run: ccm remove serverless