Transfer impl of release_attach to new home

A bunch of code has been dropped because it's no longer necessary -- yay for better data builder usage and real error handling!

src/api/release_attachment.rs

@@ -1,10 +1,45 @@
+use std::fs;
+
 
 pub fn check_release_match_repo(){}
 pub fn get_release_attachment(){}
 pub fn list_release_attachments(){
     todo!();
 }
-pub fn create_release_attachment(){}
+pub async fn create_release_attachment(
+    client: &reqwest::Client,
+    gitea_url: &str,
+    repo: &str,
+    release_id: usize,
+    files: Vec<String>,
+) -> crate::Result<()> {
+    let request_url = format!("{gitea_url}/api/v1/repos/{repo}/releases/{release_id}/assets");
+    
+    // Ensure all files exists before starting the uploads
+    for file in &files {
+        if let Err(e) = fs::exists(file) {
+            return Err(crate::Error::NoSuchFile);
+        }
+    }
+
+    for file in files {
+        println!("Uploading file {}", &file);
+        let data = reqwest::multipart::Part::stream(fs::read(&file).unwrap())
+            .file_name("attachment")
+            .mime_str("text/plain")?;
+    
+        let form= reqwest::multipart::Form::new()
+            .part("attachment", data);
+
+        let request = client
+            .post(&request_url)
+            .multipart(form)
+            .query(&[("name", file.split("/").last())])
+            .send()
+            .await?;
+    }
+    Ok(())
+}
 pub fn edit_release_attachment(){}
 pub fn delete_release_attachment(){}
 

src/lib.rs

@@ -15,6 +15,7 @@ pub enum Error {
     Placeholder, // TODO: Enumerate error modes
     WrappedReqwestErr(reqwest::Error),
     MissingAuthToken,
+    NoSuchFile, // for release attachment 'file exists' pre-check.
 }
 
 impl From<reqwest::Error> for crate::Error {