install curl to be able to push images to dockerhub

[mikaelarguedas]

looks like it's been month the trigger testing job fails. Log extract:

Run echo ${DATA} \
  echo ${DATA} \
    | curl -H "Content-Type: application/json" \
      --data @- \
      -X POST ***
  shell: sh -e {0}
  env:
    TRIGGER: true
    DATA: {
    "docker_tag": "testing"
  }

/__w/_temp/cd465d4e-1d7f-4b03-8630-d512411916bc.sh: 2: curl: not found
Error: Process completed with exit code 127.

This is an attempt to fix it by installing curl earlier in the workflow @ruffsl FYI