Take ownership of conda on Azure Mac builds (#102)

Some builds were failing because of permission issues for conda. Adding
this seems to solve those problems.

.azure-pipelines.yml

@@ -92,6 +92,12 @@ jobs:
  - bash: echo "##vso[task.prependpath]$CONDA/bin"
  displayName: Add conda to PATH
 
+ # On Hosted macOS, the agent user doesn't have ownership of Miniconda's installation
+ # directory We need to take ownership if we want to update conda or install packages
+ # globally
+ - bash: sudo chown -R $USER $CONDA
+ displayName: Take ownership of conda installation
+
  # Get the Fatiando CI scripts
  - bash: git clone --branch=1.1.1 --depth=1 https://github.com/fatiando/continuous-integration.git
  displayName: Fetch the Fatiando CI scripts