Try curl for getting HCP Access Token in HPATS (#11810)

.github/workflows/acceptance-test.yml

@@ -81,7 +81,9 @@ jobs:
           git clone git@github.com:hashicorp/hcp-packer-acceptance-tests
           cd hcp-packer-acceptance-tests
       - name: Set HCP Access Token
-        run: export HCP_ACCESS_TOKEN=$(make hcp/get-auth0-m2m-access-token)
+        run: |
+          export HCP_ACCESS_TOKEN=$(curl --request POST --header "Content-Type: application/json" --data '{"audience": "https://api.hashicorp.cloud","grant_type": "client_credentials","client_id": "'"$AUTH0_CLIENT_ID"'","client_secret": "'"$AUTH0_CLIENT_SECRET"'"}' "${AUTH0_HOST}/oauth/token" | jq '.access_token' --raw-output)
+          if [ -z $HCP_ACCESS_TOKEN ]; then; echo "HCP_ACCESS_TOKEN was not set" && exit 1; else echo "HCP_ACCESS_TOKEN set"; fi;
       - name: Run HPATS
         run: make test
   # Send a slack notification if one of the jobs defined above fails