Allow skipping the update checks using an environment variable (#900)

* Allow skipping the update checks using an environment variable

* Update `CHANGELOG.md`

Author: jessebraham

CHANGELOG.md

@@ -31,6 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add a `check-app-descriptor` bool option to `ImageArgs` and add the flag to `flash` command (#872)
 - `Connection::into_serial` to get the underlying port from the connection (#882)
 - All methods on the now removed `Target` & `ReadEFuse`, `UsbOtg` and `RtcWdtReset` traits have been implemented directly on (#891)
+- Update checks can now be skipped by setting the the `ESPFLASH_SKIP_UPDATE_CHECK` environment variable (#900)
 
 ### Changed
 

cargo-espflash/src/main.rs

@@ -57,7 +57,13 @@ enum CargoSubcommand {
         subcommand: Commands,
 
         /// Do not check for updates
-        #[clap(short = 'S', long, global = true, action)]
+        #[clap(
+            short = 'S',
+            long,
+            global = true,
+            env = "ESPFLASH_SKIP_UPDATE_CHECK",
+            action
+        )]
         skip_update_check: bool,
     },
 }

espflash/src/bin/espflash.rs

@@ -30,7 +30,13 @@ pub struct Cli {
     subcommand: Commands,
 
     /// Do not check for updates
-    #[clap(short = 'S', long, global = true, action)]
+    #[clap(
+        short = 'S',
+        long,
+        global = true,
+        env = "ESPFLASH_SKIP_UPDATE_CHECK",
+        action
+    )]
     skip_update_check: bool,
 }