add 12-alpine

12-alpine/Dockerfile

@@ -0,0 +1,25 @@
+ARG postgres_version=12
+
+# extension builder
+FROM postgres:${postgres_version}-alpine AS extension_builder
+
+RUN cd / && mkdir external_extensions && mkdir /external_extensions/sequential-uuids
+COPY lib/sequential-uuids/ /external_extensions/sequential-uuids/
+WORKDIR /external_extensions/sequential-uuids/
+
+RUN apk update && apk add build-base icu-dev postgresql-dev
+RUN make clean && make install
+# run find / -name 'sequential_uuids*' to find newly compiled files and copy to next stage
+
+# main image
+FROM postgres:${postgres_version}-alpine
+
+LABEL maintainer="[email protected]"
+
+COPY --from=extension_builder /usr/local/lib/postgresql/bitcode /usr/local/lib/postgresql/bitcode
+COPY --from=extension_builder /usr/local/share/postgresql/extension /usr/local/share/postgresql/extension
+
+# ref: https://github.com/docker-library/postgres/issues/340
+
+# after in sql:
+# CREATE EXTENSION sequential_uuids;