chore: added formatting check to circle-ci

Signed-off-by: Martin Chodur <m.chodur@seznam.cz>

.circleci/config.yml

@@ -22,7 +22,15 @@ jobs:
       - run: make deps DEPARGS="-v"
       - run: make errcheck
       - run: make check-docs
-      - run: make format
+      - run:
+          name: "Check code formating."
+          command: |
+            make format
+            if ! git diff --exit-code; then
+              echo "Code is not well formatted. Run 'make format' before pushing the code."
+              exit 1
+            fi
+      - run: make proto
       - run:
           name: "Run all tests"
           # TODO(bplotka): Setup some S3 tests for CI.

CONTRIBUTING.md

@@ -30,6 +30,7 @@ $ git merge upstream/master
 $ git checkout -b <your_branch_for_new_pr>
 $ make build
 $ <Iterate your development>
+$ make format
 $ git push origin <your_branch_for_new_pr>
 ```
 5. If you don't have a live object store ready add these envvars to skip tests for these: