Cannot include EJS partials (second issue), and missing copy action

[scscgit]

I'm unable to include a file from within a template, similar to #96.

I'm new to SAO and EJS and I'm not sure if this is the correct usage, but I didn't find anything related to it in the documentation. To reproduce it I created a new generator:
npx sao generator sao-name
npx sao --version

sao/1.7.1 win32-x64 node-v12.16.3

I added code like <% include file %>, <%- include file %>, or <% include file.txt %> to template/README.md, and then created a file template/file.txt.

Running npx sao . results in

error Error: Could not find the include file "file"
    at getIncludePath (C:\ProjectsExternal\sao-name\node_modules\ejs\lib\ejs.js:165:13)
    at includeSource (C:\ProjectsExternal\sao-name\node_modules\ejs\lib\ejs.js:309:17)
    at C:\ProjectsExternal\sao-name\node_modules\ejs\lib\ejs.js:745:26
    at Array.forEach (<anonymous>)
    at Template.generateSource (C:\ProjectsExternal\sao-name\node_modules\ejs\lib\ejs.js:721:15)
    at Template.compile (C:\ProjectsExternal\sao-name\node_modules\ejs\lib\ejs.js:574:12)
    at Object.compile (C:\ProjectsExternal\sao-name\node_modules\ejs\lib\ejs.js:392:16)
    at Transformer.render (C:\ProjectsExternal\sao-name\node_modules\jstransformer\index.js:288:44)
    at C:\ProjectsExternal\sao-name\node_modules\sao\lib\runActions.js:69:27
    at Array.forEach (<anonymous>)

I was also unable to use this as part of https://github.com/nuxt/create-nuxt-app generator, where I had a use-case of duplicating contents of one file to another. I originally wanted to use something like a copy action, but it seems there is no such thing available based on https://sao.vercel.app/saofile.html#actions (note: please add this link to https://sao.vercel.app/guide/creating-generators.html#folder-structure because it's almost impossible to find). If this use-case is supported using some workaround (except hard-coding fs usage in completed section, as mentioned by #126), please mention some example in the docs.

When debugging the issue, options at https://github.com/mde/ejs/blob/576283bb5db2f5b6d2c9f979163a84644f581697/lib/ejs.js#L174 has the value of {"client":false,"compileDebug":true,"debug":false,"openDelimiter":"<","closeDelimiter":">","delimiter":"%","strict":false,"cache":false,"localsName":"locals","legacyInclude":true,"_with":true}, and so because it's missing filename field, it isn't resolved using a relative path.