files: add content64 for base64 encoded values

src/apply.rs

@@ -15,6 +15,11 @@ pub async fn files(files: &[crate::File], root: &str) -> Result<()> {
         use crate::FileKind as K;
         match &file.kind {
             K::Content(content) => fs::write(path, content.as_bytes()).await?,
+            K::Content64(content) => {
+                use base64::prelude::{Engine as _, BASE64_STANDARD as B64};
+                let content = B64.decode(content)?;
+                fs::write(path, content).await?
+            }
             K::Dir(true) => fs::create_dir(path).await?,
             K::Dir(false) => {} // shouldn't happen, but semantic is to ignore
             K::Symlink(tgt) => fs::symlink(tgt, path).await?,