Use ecdsa instead of rsa for webhooks

Performance of RSA was so shit I couldn't run anything

Author: sbernauer

crates/stackable-webhook/src/tls.rs

@@ -8,7 +8,11 @@ use hyper::{body::Incoming, service::service_fn};
 use hyper_util::rt::{TokioExecutor, TokioIo};
 use opentelemetry::trace::{FutureExt, SpanKind};
 use snafu::{ResultExt, Snafu};
-use stackable_certs::{CertificatePairError, ca::CertificateAuthority, keys::rsa};
+use stackable_certs::{
+    CertificatePairError,
+    ca::{CertificateAuthority, DEFAULT_CA_VALIDITY_SECONDS},
+    keys::ecdsa,
+};
 use stackable_operator::time::Duration;
 use tokio::net::TcpListener;
 use tokio_rustls::{
@@ -44,12 +48,12 @@ pub enum Error {
 
     #[snafu(display("failed to encode leaf certificate as DER"))]
     EncodeCertificateDer {
-        source: CertificatePairError<rsa::Error>,
+        source: CertificatePairError<ecdsa::Error>,
     },
 
     #[snafu(display("failed to encode private key as DER"))]
     EncodePrivateKeyDer {
-        source: CertificatePairError<rsa::Error>,
+        source: CertificatePairError<ecdsa::Error>,
     },
 
     #[snafu(display("failed to set safe TLS protocol versions"))]
@@ -103,10 +107,13 @@ impl TlsServer {
         // See https://docs.rs/tokio/latest/tokio/task/fn.spawn_blocking.html
         let task = tokio::task::spawn_blocking(move || {
             let mut certificate_authority =
-                CertificateAuthority::new_rsa().context(CreateCertificateAuthoritySnafu)?;
-
+                CertificateAuthority::new_ecdsa().context(CreateCertificateAuthoritySnafu)?;
             let leaf_certificate = certificate_authority
-                .generate_rsa_leaf_certificate("Leaf", "webhook", Duration::from_secs(3600))
+                .generate_ecdsa_leaf_certificate(
+                    "Leaf",
+                    "webhook",
+                    Duration::from_secs(DEFAULT_CA_VALIDITY_SECONDS),
+                )
                 .context(GenerateLeafCertificateSnafu)?;
 
             let certificate_der = leaf_certificate