update key permissions

Author: sergiocazzolato

spread.yaml

@@ -1756,7 +1756,8 @@ suites:
 
             # Configure the ssh connection to the test vm
             if [ -n "$NESTED_REMOTE_USER_CERT" ]; then
-                echo "$NESTED_REMOTE_USER_CERT" > $TESTSTMP/cert-file
+                echo "$NESTED_REMOTE_USER_CERT" > "$TESTSTMP"/cert-file
+                chmod 0600 "$TESTSTMP"/cert-file
                 remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --cert "$TESTSTMP/cert-file"
             else
                 remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --pass ubuntu
@@ -1838,7 +1839,8 @@ suites:
             # Configure the ssh connection to the test vm
             # Configure the ssh connection to the test vm
             if [ -n "$NESTED_REMOTE_USER_CERT" ]; then
-                echo "$NESTED_REMOTE_USER_CERT" > $TESTSTMP/cert-file
+                echo "$NESTED_REMOTE_USER_CERT" > "$TESTSTMP"/cert-file
+                chmod 0600 "$TESTSTMP"/cert-file
                 remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --cert "$TESTSTMP/cert-file"
             else
                 remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --pass ubuntu
@@ -1913,8 +1915,9 @@ suites:
 
             # Configure the ssh connection to the test vm
             if [ -n "$NESTED_REMOTE_USER_CERT" ]; then
-                echo "$NESTED_REMOTE_USER_CERT" > $TESTSTMP/cert-file
-                remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --cert "$TESTSTMP/cert-file"
+                echo "$NESTED_REMOTE_USER_CERT" > "$TESTSTMP"/cert-file
+                chmod 0600 "$TESTSTMP"/cert-file
+                remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --cert "$TESTSTMP"/cert-file
             else
                 remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --pass ubuntu
             fi
@@ -2002,7 +2005,8 @@ suites:
 
             # Configure the ssh connection to the test vm
             if [ -n "$NESTED_REMOTE_USER_CERT" ]; then
-                echo "$NESTED_REMOTE_USER_CERT" > $TESTSTMP/cert-file
+                echo "$NESTED_REMOTE_USER_CERT" > "$TESTSTMP"/cert-file
+                chmod 0600 "$TESTSTMP"/cert-file
                 remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --cert "$TESTSTMP/cert-file"
             else
                 remote.setup config --host localhost --port 8022 --user "$NESTED_REMOTE_USER_NAME" --pass ubuntu