fix: correct architecture naming in v1 install script

Changes x86_64 architecture detection from 'amd64' to 'x86_64' to match
actual Flipt release file naming convention. Release files use
flipt_{os}_x86_64.tar.gz format, not flipt_{os}_amd64.tar.gz.

Fixes download URL generation that was causing 404 errors when
installing on x86_64 systems.

Author: markphelps

install.sh

@@ -62,8 +62,8 @@ uname_os() {
 uname_arch() {
     arch=$(uname -m)
     case $arch in
-        x86_64) arch="amd64" ;;
-        x64) arch="amd64" ;;
+        x86_64) arch="x86_64" ;;
+        x64) arch="x86_64" ;;
         i686) arch="386" ;;
         i386) arch="386" ;;
         aarch64) arch="arm64" ;;
@@ -91,7 +91,7 @@ uname_os_check() {
 uname_arch_check() {
     arch=$(uname_arch)
     case "$arch" in
-        amd64) return 0 ;;
+        x86_64) return 0 ;;
         arm64) return 0 ;;
     esac
     log_error "Architecture $arch is not supported"