Update to latest chicken version

dockerfiles/centos.Dockerfile

@@ -0,0 +1,23 @@
+FROM centos:8
+
+ENV CHICKEN_VERSION 5.2.0
+ENV PLATFORM linux
+
+RUN set -eux; \
+    yum install -y gcc gcc-c++ make diffutils; \
+    yum clean all; \
+    curl -sS https://code.call-cc.org/releases/${CHICKEN_VERSION}/chicken-${CHICKEN_VERSION}.tar.gz | tar xzv; \
+    cd /chicken-${CHICKEN_VERSION}; \
+    make PLATFORM=${PLATFORM}; \
+    make PLATFORM=${PLATFORM} install; \
+    make PLATFORM=${PLATFORM} check; \
+    cd /; \
+    rm -rf /chicken-${CHICKEN_VERSION}
+
+# install project assembly tool
+COPY chicken-assemble.scm /usr/bin/chicken-assemble
+RUN chicken-install clojurian:3 \
+                    records \
+                    srfi-1 \
+                    srfi-69 && \
+    chmod a+x /usr/bin/chicken-assemble