fix(version): allow users to disable version check via environment variable

Signed-off-by: Nicklas Frahm <nicklas.frahm@gmail.com>

Author: nicklasfrahm

cmd/sops/main.go

@@ -1517,8 +1517,9 @@ func main() {
 			Usage: "generate a new data encryption key and reencrypt all values with the new key",
 		},
 		cli.BoolFlag{
-			Name:  "disable-version-check",
-			Usage: "do not check whether the current version is latest during --version",
+			Name:   "disable-version-check",
+			Usage:  "do not check whether the current version is latest during --version",
+			EnvVar: "SOPS_DISABLE_VERSION_CHECK",
 		},
 		cli.StringFlag{
 			Name:   "kms, k",

version/version.go

@@ -15,8 +15,10 @@ import (
 var Version = "3.9.1"
 
 // PrintVersion prints the current version of sops. If the flag
-// `--disable-version-check` is set, the function will not attempt
-// to retrieve the latest version from the GitHub API.
+// `--disable-version-check` is set or if the environment variable
+// SOPS_DISABLE_VERSION_CHECK is set to a value that is considered
+// true by https://pkg.go.dev/strconv#ParseBool, the function will
+// not attempt to retrieve the latest version from the GitHub API.
 //
 // If the flag is not set, the function will attempt to retrieve
 // the latest version from the GitHub API and compare it to the