[PATCH proxmox 1/3] http: tls: move PROXMOX_NEW_TLS_CHECK env var name into constant

[Shannon Sterz <s.sterz@proxmox.com>]

so we can use the constant in integration tests and other users of
this crate and have a single place to adapt it.

Signed-off-by: Shannon Sterz <s.sterz@proxmox.com>
---
 proxmox-http/src/tls.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/proxmox-http/src/tls.rs b/proxmox-http/src/tls.rs
index 635b0e7f..d7a7aa98 100644
--- a/proxmox-http/src/tls.rs
+++ b/proxmox-http/src/tls.rs
@@ -1,5 +1,7 @@
 use openssl::x509::{X509StoreContextRef, X509VerifyResult};
 
+pub const PROXMOX_NEW_TLS_CHECK_VAR: &str = "PROXMOX_NEW_TLS_CHECK";
+
 ///
 /// Error type returned by failed [`openssl_verify_callback`].
 ///
@@ -41,7 +43,7 @@ pub fn openssl_verify_callback(
 ) -> Result<(), SslVerifyError> {
     let trust_openssl = ctx.error() != X509VerifyResult::APPLICATION_VERIFICATION;
 
-    let new_check = matches!(std::env::var("PROXMOX_NEW_TLS_CHECK").as_deref(), Ok("1"));
+    let new_check = matches!(std::env::var(PROXMOX_NEW_TLS_CHECK_VAR).as_deref(), Ok("1"));
 
     if openssl_valid && trust_openssl {
         if new_check && expected_fp.is_none() {
-- 
2.47.3