Will publish html files as mandrill templates, using the filename stem (without extension) as the name of the template
npm install gulp-mandrill-templates
const gulpMandrillTemplates = require('gulp-mandrill-templates');
gulp.task('publish', function () {
return gulp.src('dist/**/*.html')
.pipe(gulpMandrillTemplates({ key: process.env.MANDRILL_KEY }))
.pipe(gulp.dest('dist'));
});