feat(cli): expose CLI signer flags as environment variables (#8327)

* feat(cli): expose signer flags as environment variables

* Update .changes/cli-signer-env-vars.md

Author: Hacksore

.changes/cli-signer-env-vars.md

@@ -0,0 +1,9 @@
+---
+'tauri-cli': 'patch:enhance'
+---
+
+Read the following env vars when using the `tauri signer sign` command to make it easier to use in CI.
+
+- `TAURI_PRIVATE_KEY`
+- `TAURI_PRIVATE_KEY_PASSWORD`
+- `TAURI_PRIVATE_KEY_PATH`

tooling/cli/src/signer/sign.rs

@@ -17,13 +17,23 @@ use tauri_utils::display_path;
 #[clap(about = "Sign a file")]
 pub struct Options {
   /// Load the private key from a string
-  #[clap(short = 'k', long, conflicts_with("private_key_path"))]
+  #[clap(
+    short = 'k',
+    long,
+    conflicts_with("private_key_path"),
+    env = "TAURI_PRIVATE_KEY"
+  )]
   private_key: Option<String>,
   /// Load the private key from a file
-  #[clap(short = 'f', long, conflicts_with("private_key"))]
+  #[clap(
+    short = 'f',
+    long,
+    conflicts_with("private_key"),
+    env = "TAURI_PRIVATE_KEY_PATH"
+  )]
   private_key_path: Option<PathBuf>,
   /// Set private key password when signing
-  #[clap(short, long)]
+  #[clap(short, long, env = "TAURI_PRIVATE_KEY_PASSWORD")]
   password: Option<String>,
   /// Sign the specified file
   file: PathBuf,