Initial Taler stack with templated configs, db init script, caddy proxy

.env.example

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+POSTGRES_HOST=postgres
+POSTGRES_PORT=5432
+POSTGRES_PASSWORD=taler
+POSTGRES_ADMIN_USER=postgres
+
+TALER_EXCHANGE_DB=talerexchange
+TALER_EXCHANGE_DB_USER=talerexchange
+TALER_EXCHANGE_DB_PASSWORD=taler
+
+TALER_MERCHANT_DB=talermerchant
+TALER_MERCHANT_DB_USER=talermerchant
+TALER_MERCHANT_DB_PASSWORD=taler
+
+LIBEUFIN_DB_NAME=libeufinbank
+LIBEUFIN_DB_USER=libeufinbank
+LIBEUFIN_DB_PASSWORD=taler
+LIBEUFIN_ADMIN_USER=admin
+LIBEUFIN_ADMIN_PASSWORD=
+LIBEUFIN_MERCHANT_USER=demogeldbank
+LIBEUFIN_MERCHANT_PASSWORD=
+LIBEUFIN_MERCHANT_TOKEN=
+LIBEUFIN_USER=demogeld
+LIBEUFIN_USER_PASSWORD=
+LIBEUFIN_DEBIT_THRESHOLD=DEMOGELD:1000000
+
+# Exchange offline account enablement
+ENABLE_EXCHANGE_ACCOUNT=0
+PAYTO_URI=payto://x-taler-bank/yourbank.domain.tld/demogeld?receiver-name=demogeld
+EXCHANGE_KEYS_URL=http://exchange.internal:8081/keys
+EXCHANGE_WAIT_RETRIES=60
+EXCHANGE_WAIT_INTERVAL=2
+# Optional curl flags for HTTPS with custom certs, etc. Example: "-k"
+EXCHANGE_CURL_OPTS=
+
+# Caddy reverse proxy
+CADDY_ACME_EMAIL=ops@example.com
+BANK_HOST=bank.domain.tld
+EXCHANGE_HOST=exchange.domain.tld
+MERCHANT_HOST=merchant.domain.tld
+
+# Secrets path (host path mounted into /etc/taler/secrets)
+EXCHANGE_SECRETS_PATH=./exchange/secrets
+
+# Master key (public) for exchange/merchant configs
+MASTER_PUBLIC_KEY=
+
+# Optional token provisioning output path
+TOKEN_OUTPUT=bank/token-info.txt
+
+TALER_DOMAIN=localhost
+TALER_EXCHANGE_PORT=8081
+TALER_MERCHANT_PORT=9966
+LIBEUFIN_BANK_PORT=8080
+EXCHANGE_BASE_URL=https://exchange.domain.tld/
+EXCHANGE_SHOPPING_URL=https://exchange.domain.tld/
+OPEN_BANKING_GATEWAY_URL=https://bank.domain.tld
+BANK_BASE_URL=https://bank.domain.tld/
+
+TALER_CURRENCY=DEMOGELD