fix: pin reviewdog version (#26)

Fix #25.

Author: bfabio

Dockerfile

@@ -1,6 +1,13 @@
 FROM italia/publiccode-parser-go:v4.3.7
 
-RUN wget -O - https://raw.githubusercontent.com/reviewdog/reviewdog/master/install.sh | sh -s -- -b /usr/local/bin
+ARG REVIEWDOG_FILE=reviewdog_0.21.0_Linux_x86_64.tar.gz
+ARG REVIEWDOG_SHA256=ad5ce7d5ffa52aaa7ec8710a8fa764181b6cecaab843cc791e1cce1680381569
+
+RUN set -eux; \
+    wget -q "https://github.com/reviewdog/reviewdog/releases/download/v0.21.0/${REVIEWDOG_FILE}" \
+    && echo "${REVIEWDOG_SHA256}  ${REVIEWDOG_FILE}" | sha256sum -c \
+    && tar -xzf ${REVIEWDOG_FILE} -C /usr/local/bin reviewdog
+
 COPY entrypoint.sh /entrypoint.sh
 
 ENTRYPOINT ["/entrypoint.sh"]