add docker instructions to readme

README.md

@@ -13,3 +13,23 @@ UpdateItem, PutItem and GetItem should be trivial to implement.
 It's designed for those times you want [DynamoDB Local](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBLocal.html),
 but don't want a full Java VM, etc. On small data sets, this static executable
 executable will use <10MB of resident memory.
+
+# Running as Docker
+
+Latest version can be found at [https://r.lerch.org/repo/ddbbolt/tags/](https://r.lerch.org/repo/ddbbolt/tags/).
+Versions are tagged with the short hash of the git commit, and are
+built as a multi-architecture image based on a scratch image.
+
+You can run the docker image with a command like:
+
+```sh
+docker run \
+  --volume=$(pwd)/ddbbolt:/data \
+  -e FILE=/data/ddb.db          \
+  -e PORT=8080                  \
+  -p 8080:8080                  \
+  -d                            \
+  --name=ddbbolt                \
+  --restart=unless-stopped      \
+  r.lerch.org/ddbbolt:f501abe
+```