Move package manager detection into install_package so we don't bail on macOS

Author: marcprux

.github/workflows/scripts/install-and-build-with-sdk.sh

@@ -92,18 +92,17 @@ if [[ -n "$SWIFT_BUILD_FLAGS" ]]; then
     log "Additional build flags: $SWIFT_BUILD_FLAGS"
 fi
 
-# Detect package manager
-if command -v apt >/dev/null 2>&1; then
-    INSTALL_PACKAGE_COMMAND="apt update -q && apt install -yq"
-elif command -v dnf >/dev/null 2>&1; then
-    INSTALL_PACKAGE_COMMAND="dnf install -y"
-elif command -v yum >/dev/null 2>&1; then
-    INSTALL_PACKAGE_COMMAND="yum install -y"
-else
-    fatal "No supported package manager found"
-fi
-
 install_package() {
+    # Detect package manager
+    if command -v apt >/dev/null 2>&1; then
+        INSTALL_PACKAGE_COMMAND="apt update -q && apt install -yq"
+    elif command -v dnf >/dev/null 2>&1; then
+        INSTALL_PACKAGE_COMMAND="dnf install -y"
+    elif command -v yum >/dev/null 2>&1; then
+        INSTALL_PACKAGE_COMMAND="yum install -y"
+    else
+        fatal "No supported package manager found"
+    fi
     eval "$INSTALL_PACKAGE_COMMAND $1"
 }