fix: [postgres] mirrored dependency to external ressource upon build

postgres/build/Dockerfile

@@ -18,6 +18,7 @@ RUN mkdir -p /tmp/build && \
 
 RUN cd /tmp/build && \
     sed -ri 's/^(\s+make -j1 check.*)/#\1/g' APKBUILD && \
+    sed -ri 's%^source="http://www.maier-komor.de/software/mbuffer/mbuffer-\$pkgver.tgz"%source="https://docker.0k.io/downloads/mbuffer-$pkgver.tgz"%' APKBUILD && \
     abuild-keygen -a -i && \
     abuild -r
 
@@ -25,7 +26,7 @@ USER root
 
 RUN apk add curl
 
-RUN curl -L https://github.com/0k/pgm/raw/master/bin/pgm > /bin/pgm && \
+RUN curl -L https://raw.githubusercontent.com/0k/pgm/0.0.2/bin/pgm > /bin/pgm && \
     chmod +x /bin/pgm
 
 FROM common