add environment example

.eng.example

@@ -0,0 +1,16 @@
+# generate this in Settings/API/Create API Key
+ST_API_KEY=
+
+# secret for webhook, generate with openssl rand -hex 32
+WEBHOOK_SECRET=
+
+# set eligible appointment types for the action, comma-separated (for example, senate, recall)
+ELIGIBLE_APPOINTMENTS=s
+
+# location of SQLite database file
+DB_PATH=worker.db
+
+
+# set this to 0 to write to Solidarity Tech's API, default is to keep it read_only
+DRY_RUN=1
+