Fix OpenSSL config issue in CI environment

The spack-installed OpenSSL has a corrupted config file path. Work around
this by setting OPENSSL_CONF=/dev/null when generating the self-signed
certificate, since -subj provides all necessary information.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: eisenhauer

testing/adios2/engine/bp/generateXRootDHttpConfig.sh

@@ -20,11 +20,19 @@ mkdir -p xroot-http/etc/xrootd
 mkdir -p xroot-http/certs
 if [ ! -f xroot-http/certs/server.crt ]; then
     echo "Generating self-signed SSL certificate..."
-    openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
+    # Unset OPENSSL_CONF to avoid issues with spack's corrupted OpenSSL config path
+    # The -batch flag and -subj provide all needed info without requiring a config file
+    OPENSSL_CONF=/dev/null openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
         -keyout xroot-http/certs/server.key \
         -out xroot-http/certs/server.crt \
-        -subj "/CN=localhost"
-    echo "Certificate generated successfully"
+        -subj "/CN=localhost" \
+        -batch
+    if [ $? -eq 0 ]; then
+        echo "Certificate generated successfully"
+    else
+        echo "ERROR: Certificate generation failed"
+        exit 1
+    fi
 fi
 
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