add noaa21 support to rdrmerge

@brucef mind giving this a review, merge, & publish?

note I think this package is the last thing needed at:

https://gitlab.ssec.wisc.edu/groups/directbroadcast/-/packages

before we can move the l0tools requirements.txt away from the sips

edosl0util/cli/rdrmerge.py

@@ -41,7 +41,7 @@ def rdrs_to_process(inputs):
     # filter and validiate rdrs
     to_process = {
         (s, p): []
-        for s in ("snpp", "j01")
+        for s in ("snpp", "j01", "j02")
         for p in ("RNSCA-RVIRS", "RCRIS-RNSCA", "RATMS-RNSCA")
     }
     for rdr in inputs:
@@ -55,9 +55,8 @@ def rdrs_to_process(inputs):
             continue
         # validate satellite
         sat = parts[1]
-        sat = {"jpss1": "j01", "noaa20": "j01", "npp": "snpp"}.get(sat, sat)
-        sat = "j01" if sat in ("jpss1", "noaa20") else sat
-        if sat not in ("snpp", "j01"):
+        sat = {"jpss1": "j01", "noaa20": "j01", "jpss2": "j02", "noaa21": "j02", "npp": "snpp"}.get(sat, sat)
+        if sat not in ("snpp", "j01", "j02"):
             LOG.debug("skipping unsupported satellite %s", sat)
             continue
 
@@ -97,6 +96,9 @@ start_of_mission = {
     "j01": datetime(2017, 11, 18),
     "jpss1": datetime(2017, 11, 18),
     "noaa20": datetime(2017, 11, 18),
+    "j02": datetime(2022, 11, 10),
+    "jpss2": datetime(2022, 11, 10),
+    "noaa21": datetime(2022, 11, 10),
 }