feat: validate workflow schema

.github/scripts/validate-workflow-schema.js

@@ -0,0 +1,69 @@
+const core = require('@actions/core');
+const Ajv = require('ajv');
+const yaml = require('js-yaml');
+const fs = require('fs');
+
+
+function getFileExtension(filename){
+    return filename.split('.').pop();
+}
+
+function validateYmlSchema(filename){
+    const fileExtensions = ['yml', 'yaml'];
+    if(fileExtensions.includes(getFileExtension(filename))){
+        // Read the schema file and workflow file synchronously
+        let schema = fs.readFileSync('.github/scripts/yml-schema.json', {encoding:'utf8', flag:'r'});
+        schema = JSON.parse(schema);
+        const file = fs.readFileSync(filename, 'utf8');
+        try{
+            const target = yaml.load(file);
+            const ajv = new Ajv({ strict: false, allErrors: true });
+            const validator = ajv.compile(schema);
+            const valid = validator(target);
+            // Return the status and log for each workflow file validated
+            if (!valid) {
+                return {
+                    'status' : false,
+                    'log': validator.errors
+                }          
+            } else {
+                return {
+                    'status' : true,
+                    'log': 'Validation successful'
+                }
+            }
+        }
+        catch(err){
+            return {
+                'status' : false,
+                'log': err
+            }
+        }
+    } else {
+        return {
+            'status' : true,
+            'log': 'Not a yml/yaml file'
+        }
+    }
+}
+
+module.exports = (allFiles) => {
+    const allLogs = {}
+    allFiles = allFiles.split(' ');
+    for(file of allFiles){
+        let log = validateYmlSchema(file);
+        if(!log['status']){
+            allLogs[file] = log['log']
+        }
+    }
+    // Workflow fails if an error is detected in any file
+    if(Object.keys(allLogs).length > 0){
+        for(file in allLogs){
+            console.log("ERROR IN FILE " + file)
+            console.log(allLogs[file]);
+        }
+        core.setFailed('There are errors in the workflow files');
+    } else {
+        console.log('No errors detected in the yml/yaml files');
+    }
+}