Merge pull request #81 from mzedel/fix-a-python-install

[python-formatting-pipeline] added missing dependencies after switch to python image

.gitlab-ci-check-python3-format.yml

@@ -55,7 +55,7 @@ test:check-python3-formatting:
       BLACK_FORMATTER_VERSION: "19.10b0" # Hard-coded and unconfigurable
   before_script:
     # Install dependencies
-    - apk add --no-cache git curl bash
+    - apk add --no-cache git curl bash gcc musl-dev
     - pip3 install black==$BLACK_FORMATTER_VERSION
     # Rename the branch we're on, so that it's not in the way for the
     # subsequent fetch. It's ok if this fails, it just means we're not on any