Include year in .env, update references in script

PSILARTEMP.py

@@ -31,6 +31,7 @@ load_dotenv()
 config = configparser.ConfigParser()
 config.read("PSILARTEMP.cfg")
 
+year = os.getenv("YEAR")
 weatherdata_path = os.getenv("WEATHER_DATA_DIR")
 tmp_path = "tmp/"
 out_path = os.getenv("DATA_DIR")
@@ -42,7 +43,7 @@ local_timezone = pytz.timezone("Europe/Oslo")
 # Calculate cumulated degree days above 5 degrees after 1st of April
 # Remove all values before April 1st
 subprocess.run(
-    f"cdo -selname,TM -seldate,2023-04-01T00:00:00,2023-12-31T00:00:00 {weatherdata_path}met_1_0km_nordic-2023.nc {tmp_path}TM_from_april.nc",
+    f"cdo -selname,TM -seldate,{year}-04-01T00:00:00,{year}-12-31T00:00:00 {weatherdata_path}met_1_0km_nordic-{year}.nc {tmp_path}TM_from_april.nc",
     shell=True,
 )
 # Subtracting 5 deg C from all cells