How can i parse log file and match specific strings with grok filter

i have a log that looks like this

BUILD_DISPLAY_NAME=#998
BUILD_NUMBER=998
JENKINS_URL=https:///jenkins.com
BUILD_ID=998
DEVICE_CRED_PSW=pass
GIT_PREVIOUS_SUCCESSFUL_COMMIT=f847h56934875f6239487562j3498
JOB_BASE_NAME=master

i have this configuration within my logstash

input {
  file {
        mode => "read"
        exit_after_read => true
        path => "/data/envVar_regression_builds_210913_135255.log"
        start_position => "beginning"
        file_chunk_size => 1000000
        file_completed_action => "log"
        file_completed_log_path => "/var/lib/logstash/logged_file.list"
        sincedb_path => "/dev/null"
        #ignore_older => "10 m"
  }
}

output {

        stdout { codec => rubydebug { metadata => true } }
}

how can i grab each string (like BUILD_ID=) and parse it via grok so i can filter its results?

tried this without success

filter {
      grok {
        match => {
          "message" => "BUILD_NUMBER= %{NUMBER:build_number}"
        }
      }
}

I would break_on_match => false and an array of patterns. Like this.

Your example grok does not match because it expects a space after the =

still not working

input {
  file {
        mode => "read"
        exit_after_read => true
        path => "/data/envVar_regression_builds_210913_135255.log"
        start_position => "beginning"
        file_chunk_size => 1000000
        file_completed_action => "log"
        file_completed_log_path => "/var/lib/logstash/logged_file.list"
        sincedb_path => "/dev/null"
        #ignore_older => "10 m"
  }
}

filter {
      grok {
        break_on_match => false
        match => {
            "message" => [
                "BUILD_NUMBER=%{NUMBER:build_number}"
            ]
        }
    }
}

output {
        #elasticsearch {
        #        hosts => ["10.56.10.152:9200"]
        #        index => "jenkins_env_vars"
        #}

        stdout { codec => rubydebug { metadata => true } }
}

anyone?