[INLONG-4769][CI] Fix error trigger condition in the docker workflow

[shink]

Fixes #4769

Motivation

Now, if only the source codes are changed, the docker workflow won't be triggerd.
If the source codes are changed, the docker workflow should be triggered when pushing them, and not in a pull request.

Modifications

In a pull request. the docker workflow is only triggered when the build files are changed.
In a pushed commit, changes to the source codes or build files will both trigger the docker workflow.
So, if you just changed the source codes, the docker workflow will not be triggered in you pull request, but it will be triggered when your pull request is merged.

on:
  push:
    paths:
      - '.github/workflows/ci_docker.yml'
      - '**/pom.xml'
      - 'inlong-agent/**'
      - 'inlong-audit/**'
      - 'inlong-common/**'
      - 'inlong-dashboard/**'
      - 'inlong-dataproxy/**'
      - 'inlong-distribution/**'
      - 'inlong-manager/**'
      - 'inlong-sdk/**'
      - 'inlong-sort/**'
      - 'inlong-sort-standalone/**'
      - 'inlong-tubemq/**'
      - '!**.md'

  pull_request:
    paths:
      - '.github/workflows/ci_docker.yml'
      - '**/Dockerfile'
      - 'inlong-agent/agent-docker/**'
      - 'inlong-audit/audit-docker/**'
      - 'inlong-dataproxy/dataproxy-docker/**'
      - 'inlong-manager/manager-docker/**'
      - 'inlong-tubemq/tubemq-docker/**'
      - '!**.md'