Add --hash flag to analyse command

This is the command I use the most for debugging but almost all of the time taken to run it is from hashing the file. This is mitigated in other commands because the file is being hashed while it's downloading.

This makes the default behaviour to not hash the file. Using `--hash` will hash the file.

src/commands/analyse.rs

@@ -15,6 +15,10 @@ use std::fs::File;
 pub struct Analyse {
     #[arg(value_parser = is_valid_file, value_hint = clap::ValueHint::FilePath)]
     file_path: Utf8PathBuf,
+
+    /// Hash the file and include it in the InstallerSha256 field
+    #[arg(long, alias = "sha256")]
+    hash: bool,
 }
 
 impl Analyse {
@@ -25,13 +29,14 @@ impl Analyse {
             .file_path
             .file_name()
             .unwrap_or_else(|| self.file_path.as_str());
-        let analyser = FileAnalyser::new(&mmap, file_name)?;
-        let mut installers = analyser.installers;
-        let sha_256 = Sha256String::from_hasher(&Sha256::digest(&mmap))?;
-        for installer in &mut installers {
-            installer.sha_256 = sha_256.clone();
+        let mut analyser = FileAnalyser::new(&mmap, file_name)?;
+        if self.hash {
+            let sha_256 = Sha256String::from_hasher(&Sha256::digest(&mmap))?;
+            for installer in &mut analyser.installers {
+                installer.sha_256 = sha_256.clone();
+            }
         }
-        let yaml = match installers.as_slice() {
+        let yaml = match analyser.installers.as_slice() {
             [installer] => serde_yaml::to_string(installer)?,
             installers => serde_yaml::to_string(installers)?,
         };