Minor fixes and split of the 'inventory' task

• Fixing the usage of vault passphrase read from pass by continuing even if a passphrase is not found in the local password store. ⚠️ these changes introduced another bug preventing the usage of pass in this version, fixed in next version 0.15.0 ⚠️
• Rename the existing inventory task to fetch-inventory and creating a new inventory task which lists the currently used inventory (specified by the env=my-inventory variable)