add pgtap on docker

plpgsql/Dockerfile

@@ -10,14 +10,35 @@ ENV PGDATA /var/lib/postgresql/data_local
 
 RUN mkdir -p "$PGDATA" && chown -R postgres:postgres "$PGDATA" && chmod 777 "$PGDATA"
 
+ADD ./*.sh /app/
+ADD ./src /app/src
+
+# PGUNIT
+FROM base as pgunit
+
 RUN apt-get update \
  && apt-get install -y --no-install-recommends ca-certificates wget \
  && rm -rf /var/lib/apt/lists/*
 
-ADD ./*.sh /app/
-ADD ./src /app/src
-
 ADD ./pgunit/initialize.sh /app/
 ADD ./pgunit/*.sql /app/
 RUN chmod +x ./*.sh \
  && ./initializeDocker.sh
+
+# PGTAP
+FROM base as pgtap
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends ca-certificates build-essential git-core libv8-dev curl postgresql-server-dev-12 \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN mkdir -p /tmp/pgtap \
+ && cd /tmp/pgtap \
+ && git clone https://github.com/theory/pgtap.git /tmp/pgtap \
+ && make \
+ && make install \
+ && cpan TAP::Parser::SourceHandler::pgTAP
+
+ADD ./pgtap/initialize.sh /app/
+RUN chmod +x ./*.sh \
+ && ./initializeDocker.sh