handle missing CIRCLE_COMPARE_URL about entria-deploy

[sibelius]

related to danger/danger#45

[sibelius]

check this https://discuss.circleci.com/t/circle-compare-url-is-empty-when-running-a-workflow-job/25299/5

LAST_SUCCESSFUL_BUILD_URL="https://circleci.com/api/v1.1/project/github/$CIRCLE_PROJECT_USERNAME/$CIRCLE_PROJECT_REPONAME/tree/$CIRCLE_BRANCH?filter=completed&limit=1"
LAST_SUCCESSFUL_COMMIT=`curl -Ss -u "$API_KEY:" $LAST_SUCCESSFUL_BUILD_URL | jq -r '.[0]["vcs_revision"]'`
CHANGES_SINCE_LAST_COMMIT=`git diff --name-only $CIRCLE_SHA1..$LAST_SUCCESSFUL_COMMIT`
changesArray=( $CHANGES_SINCE_LAST_COMMIT )

[sibelius]

related to https://github.com/danger/danger/blob/master/lib/danger/ci_source/circle_api.rb

[sibelius]

check this https://github.com/iynere/compare-url-orb

[sibelius]

we can use pipeline variables

https://circleci.com/docs/2.0/pipeline-variables/#pipeline-values

CIRCLE_COMPARE_URL: << pipeline.project.git_url >>/compare/<< pipeline.git.base_revision >>..<<pipeline.git.revision>>