Fork pgtap-docker to support arm64 (#2411)

* feat(sql): Fork pgtap to support arm64

This forks pgtap-docker and builds the image locally,
and updates our references to use our forked image.

* fixup! feat(sql): Fork pgtap to support arm64

testing/dbtest/pgtap-docker/Dockerfile

@@ -0,0 +1,34 @@
+ARG PG_VERSION
+FROM postgres:${PG_VERSION}-alpine
+
+ARG PG_VERSION
+ARG PGTAP_VERSION=v1.2.0
+
+RUN echo 'http://dl-cdn.alpinelinux.org/alpine/v3.8/main'>> /etc/apk/repositories \
+    && echo 'http://dl-cdn.alpinelinux.org/alpine/v3.6/main'>> /etc/apk/repositories \
+    && apk add --no-cache --update curl wget git openssl \
+      build-base make perl perl-dev
+
+# install pg_prove
+RUN PERL_MM_USE_DEFAULT=1 cpan -T TAP::Harness::JUnit \
+  && PERL_MM_USE_DEFAULT=1 cpan -T TAP::Parser::SourceHandler::pgTAP
+
+# install pgtap
+RUN git clone https://github.com/theory/pgtap.git \
+    && cd pgtap && git checkout tags/$PGTAP_VERSION \
+    && make
+
+COPY test.sh /test.sh
+RUN chmod +x /test.sh
+
+WORKDIR /
+
+ENV DATABASE="" \
+    HOST=db \
+    PORT=5432 \
+    USER="postgres" \
+    PASSWORD="" \
+    TESTS="/test/*.sql"
+
+ENTRYPOINT ["/test.sh"]
+CMD [""]