Add configuration info

storage-bigtable/init-bigtable.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+#
+# Configures a BigTable instance with the expected tables
+#
+
+set -e
+
+instance=solana-ledger
+
+cbt=(
+  cbt
+  -instance
+  "$instance"
+)
+if [[ -n $BIGTABLE_EMULATOR_HOST ]]; then
+  cbt+=(-project emulator)
+fi
+
+for table in blocks tx tx-by-addr; do
+  (
+    set -x
+    "${cbt[@]}" createtable $table
+    "${cbt[@]}" createfamily $table x
+    "${cbt[@]}" setgcpolicy $table x maxversions=1
+    "${cbt[@]}" setgcpolicy $table x maxage=360d
+  )
+done