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

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

Author: nicklasfrahm

version/version.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"os"
 	"strings"
 
 	"github.com/blang/semver"
@@ -15,8 +16,9 @@ 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 has any value, 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
@@ -27,7 +29,7 @@ func PrintVersion(c *cli.Context) {
 
 	out.WriteString(fmt.Sprintf("%s %s", c.App.Name, c.App.Version))
 
-	if c.Bool("disable-version-check") {
+	if c.Bool("disable-version-check") || os.Getenv("SOPS_DISABLE_VERSION_CHECK") != "" {
 		out.WriteString("\n")
 	} else {
 		upstreamVersion, upstreamURL, err := RetrieveLatestReleaseVersion()