Added support for deployment using podman

podman/env.sample

@@ -0,0 +1,16 @@
+# Rename this file to .env and modify the values
+#
+# Connection string for Umami’s database.
+# If you use the bundled DB container, "db" is the hostname.
+DATABASE_URL=postgresql://umami:replace-me-with-a-random-string@db:5432/umami
+
+# Database type (e.g. postgresql)
+DATABASE_TYPE=postgresql
+
+# A secret string used by Umami (replace with a strong random string)
+APP_SECRET=replace-me-with-a-random-string
+
+# Postgres container defaults.
+POSTGRES_DB=umami
+POSTGRES_USER=umami
+POSTGRES_PASSWORD=replace-me-with-a-random-string