ci: job to check contracts build warnings (#11962)

Adds a new compiler job to check for contract build warnings.
Other existing build jobs don't compile the entire set of contracts
and we do want to be able to check for warnings across the board.

.circleci/config.yml

@@ -209,9 +209,7 @@ jobs:
     parameters:
       build_command:
         type: string
-        default: |
-          just prebuild
-          forge build --deny-warnings
+        default: just build
     steps:
       - checkout
       - install-contracts-dependencies
@@ -1616,10 +1614,8 @@ workflows:
     jobs:
       - go-mod-download
       - contracts-bedrock-build:
-          name: contracts-bedrock-build
-          build_command: |
-            # Note: scripts are included, to be available to op-e2e
-            forge build --skip test
+          # Build with just core + script contracts.
+          build_command: forge build --skip test --deny-warnings
       - contracts-bedrock-tests:
           # Test everything except PreimageOracle.t.sol since it's slow.
           name: contracts-bedrock-tests
@@ -1629,12 +1625,12 @@ workflows:
             TEST_FILES=$(echo "$TEST_FILES" | circleci tests split --split-by=timings)
             TEST_FILES=$(echo "$TEST_FILES" | sed 's|./test/||')
             MATCH_PATH="./test/{$(echo "$TEST_FILES" | paste -sd "," -)}"
-            forge test --match-path "$MATCH_PATH"
+            forge test --deny-warnings --match-path "$MATCH_PATH"
       - contracts-bedrock-tests:
           # PreimageOracle test is slow, run it separately to unblock CI.
           name: contracts-bedrock-tests-preimage-oracle
           test_parallelism: 1
-          test_command: forge test --match-path ./test/cannon/PreimageOracle.t.sol
+          test_command: forge test --deny-warnings --match-path ./test/cannon/PreimageOracle.t.sol
       - contracts-bedrock-tests:
           # Heavily fuzz any fuzz tests that have been added or modified.
           name: contracts-bedrock-tests-heavy-fuzz-modified
@@ -2141,7 +2137,10 @@ workflows:
       - cannon-prestate:
           requires:
             - go-mod-download
-      - contracts-bedrock-build
+      - contracts-bedrock-build:
+          build_command: forge build --skip test
+          context:
+            - slack
       - go-e2e-test:
           name: op-e2e-cannon-tests<< matrix.variant >>
           matrix: