Drone CI generator support + Drone CI docs improvement

CHANGELOG.md

@@ -19,6 +19,9 @@ Note: Can be used with `oxsecurity/megalinter@beta` in your GitHub Action mega-l
   - [eslint](https://eslint.org) from 8.30.0 to **8.31.0** on 2022-12-31
   - [checkstyle](https://checkstyle.sourceforge.io) from 10.5.0 to **10.6.0** on 2023-01-01
 <!-- linter-versions-end -->
+- Drone CI enhancements
+  - Config generator tool now supports Drone CI
+  - Added information about how to change trigger rules for Drone CI workflow
 - New MegaLinter plugin: [linkcheck](https://github.com/shiranr/linkcheck): Plugin to check and validate Markdown links. 
 
 ## [v6.17.0] - 2022-12-27

README.md

@@ -699,6 +699,32 @@ steps:
 
 This uses the [Drone CI docker runner](https://docs.drone.io/pipeline/docker/overview/), so it's needed to install and configure it beforehand on your Drone CI server.
 
+#### (Optional) Adjusting trigger rules
+
+The Drone CI workflow should trigger automatically for every scenario (push, pull request, sync...) however, you can *optionally* change this behavior by changing the trigger. For example:
+
+```yaml
+kind: pipeline
+type: docker
+name: MegaLinter
+
+workspace:
+  path: /tmp/lint
+
+steps: 
+
+- name: megalinter
+  image: oxsecurity/megalinter:v6
+  environment:
+    DEFAULT_WORKSPACE: /tmp/lint
+
+trigger:
+  event:
+  - push
+```
+
+The workflow above should only trigger on push, not on any other situation. For more information about how to configure Drone CI trigger rules, [click here](https://docs.drone.io/pipeline/triggers/).
+
 ### Docker container
 
 You can also run megalinter with its Docker container, just execute this command:

mega-linter-runner/generators/mega-linter/index.js

@@ -45,6 +45,7 @@ When you don't know what option to select, please use default values`
         default: "gitHubActions",
         choices: [
           { name: "GitHub Actions", value: "gitHubActions" },
+          { name: "Drone CI", value: "droneCI" },
           { name: "Jenkins", value: "jenkins" },
           { name: "GitLab CI", value: "gitLabCI" },
           { name: "Azure Pipelines", value: "azure" },
@@ -138,6 +139,7 @@ When you don't know what option to select, please use default values`
   writing() {
     // Generate workflow config
     this._generateGitHubAction();
+    this._generateDroneCI();
     this._generateJenkinsfile();
     this._generateGitLabCi();
     this._generateAzurePipelines();
@@ -231,7 +233,19 @@ When you don't know what option to select, please use default values`
       }
     );
   }
-
+  _generateDroneCI() {
+    if (this.props.ci !== "droneCI") {
+      return;
+    }
+    this.fs.copyTpl(
+      this.templatePath(".drone.yml"),
+      this.destinationPath(".drone.yml"),
+      {
+        APPLY_FIXES: this.props.applyFixes === true ? "all" : "none",
+        DEFAULT_BRANCH: this.props.defaultBranch,
+      }
+    );
+  }
   _generateJenkinsfile() {
     if (this.props.ci !== "jenkins") {
       return;

mega-linter-runner/generators/mega-linter/templates/.drone.yml

@@ -0,0 +1,15 @@
+kind: pipeline
+type: docker
+name: MegaLinter
+
+
+workspace:
+  path: /tmp/lint
+
+steps: 
+
+
+- name: megalinter
+  image: oxsecurity/megalinter:v6
+  environment:
+   DEFAULT_WORKSPACE: /tmp/lint