ci: fix wrong variable name in shared.sh's ciCommandAddPath

Author: pietroalbini

src/ci/shared.sh

@@ -99,7 +99,7 @@ function ciCommandAddPath {
     if isAzurePipelines; then
         echo "##vso[task.prependpath]${path}"
     elif isGitHubActions; then
-        echo "::add-path::${value}"
+        echo "::add-path::${path}"
     else
         echo "ciCommandAddPath only works inside CI!"
         exit 1