Document stac-geoparquet and sentinel-2-l2a workflow creation (#304)

* Document how stac-geoparquet workflow was created

* sentinel-2 too

* Bump version

* Increase chunk length

datasets/sentinel-2/README.md

@@ -19,5 +19,5 @@ az acr build -r {the registry} --subscription {the subscription} -t pctasks-sent
 Created with
 
 ```
-pctasks dataset process-items --is-update-workflow sentinel-2-l2a-update -d datasets/sentinel-2/dataset.yaml
+pctasks dataset process-items --is-update-workflow sentinel-2-l2a-update -d datasets/sentinel-2/dataset.yaml -u
 ```

datasets/sentinel-2/dataset.yaml

@@ -36,6 +36,6 @@ collections:
             # But we start at depth=2 thanks to the split, so we use a depth of 5 here.
             min_depth: 5
             max_depth: 5
-            chunk_length: 5000
+            chunk_length: 20000
     chunk_storage:
       uri: blob://sentinel2l2a01/sentinel2-l2-info/pctasks-chunks/

datasets/stac-geoparquet/README.md

@@ -19,4 +19,12 @@ This requires the following permissions
 By default, this workflow will generate geoparquet assets for all collections.
 If you want to select a subset of collections, you can use either:
 1. `extra_skip`: This will skip certain collections
-1. `collections`: This will only generate geoparquet for the specified collection(s).
+1. `collections`: This will only generate geoparquet for the specified collection(s).
+
+## Updates
+
+The workflow used for updates was registered with
+
+```
+pctasks workflow update datasets/workflows/stac-geoparquet.yaml
+```