check if commit is on master

.circleci/config.yml

@@ -5,6 +5,22 @@ version: 2
 
 # set of jobs to run
 jobs:
+    commit-on-master-check:
+        docker:
+            - image: riscvboom/riscvboom-images:0.0.5
+        environment:
+            JVM_OPTS: -Xmx3200m # Customize the JVM maximum heap limit
+            TERM: dumb
+
+        steps:
+            # Checkout the code
+            - checkout
+
+            - run:
+                name: Check commits of each submodule
+                command: |
+                    .circleci/check-commit.sh
+
     install-riscv-toolchain:
         docker:
             - image: riscvboom/riscvboom-images:0.0.5
@@ -470,6 +486,9 @@ workflows:
     version: 2
     build-and-test-rebar-integration:
         jobs:
+            # check to make sure commits are on master
+            - commit-on-master-check
+
             # Make the toolchains
             - install-riscv-toolchain