fix: read version from python-version-file only if python-version is unset

Author: kishaningithub

action.yml

@@ -2,7 +2,7 @@ name: 'Setup python amazon linux'
 description: 'setup-python action for amazon linux self hosted runners'
 inputs:
   python-version:
-    description: 'Version of python to be installed. Reads from .python-version if unset.'
+    description: 'Version of python to be installed. Reads from python-version-file if unset.'
   python-version-file:
     description: 'Version of python to be installed'
     default: '.python-version'

find-desired-python-version.sh

@@ -6,7 +6,8 @@ specified_version="$1"
 specified_version_file="$2"
 
 desired_python_version="${specified_version}"
-if [ -f "${specified_version_file}" ]; then
+
+if [[ -z "${desired_python_version}" && -f "${specified_version_file}" ]]; then
   desired_python_version=$(cat "${specified_version_file}")
 fi