reverting alpine back to v3.12 (#48)

CHANGELOG.md

@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+## [v1.2.3] - 2021-03-15
+### Fixed
+* Reverted to Alpine Linux v3.12 because of an issue with seccomp. (see #47)
+
 ## [v1.2.2] - 2021-03-10
 ### Fixed
 * Allow configuring of the "trading_agreement" setting for German citizens using Kraken.
@@ -41,7 +45,8 @@ Due to regulatory changes in The Netherlands, BL3P and Bitvavo currently require
 ### Added
 * A Python based fallback mechanism for 32bits systems. Unfortunately a bug prevented Raspberry Pi users from using Xpubs properly. The system will automatically use the native, more advanced method or derivation for systems that are capable and degrade to the Python tool without people noticing.
 
-[Unreleased]: https://github.com/Jorijn/bitcoin-dca/compare/v1.2.2...HEAD
+[Unreleased]: https://github.com/Jorijn/bitcoin-dca/compare/v1.2.3...HEAD
+[v1.2.2]: https://github.com/Jorijn/bitcoin-dca/compare/v1.2.2...v1.2.3
 [v1.2.2]: https://github.com/Jorijn/bitcoin-dca/compare/v1.2.1...v1.2.2
 [v1.2.1]: https://github.com/Jorijn/bitcoin-dca/compare/v1.2.0...v1.2.1
 [v1.2.0]: https://github.com/Jorijn/bitcoin-dca/compare/v1.1.0...v1.2.0

Dockerfile

@@ -1,3 +1,6 @@
+ARG PHP_VERSION="7.4"
+ARG ALPINE_VERSION="3.12"
+
 ##################################################################################################################
 # Dependency Stage
 ##################################################################################################################
@@ -22,7 +25,7 @@ RUN composer install \
 ##################################################################################################################
 # Base Stage
 ##################################################################################################################
-FROM php:7.4-cli-alpine as base_image
+FROM php:${PHP_VERSION}-cli-alpine${ALPINE_VERSION} as base_image
 
 RUN apk --no-cache update \
     && apk --no-cache add gmp-dev python3 py3-pip \