Update to 4.7.4

Signed-off-by: Isaac Bennetch <bennetch@gmail.com>

Dockerfile

@@ -14,8 +14,8 @@ COPY run.sh /run.sh
 RUN chmod u+rwx /run.sh
 
 # Calculate download URL
-ENV VERSION 4.7+snapshot
-ENV URL https://files.phpmyadmin.net/snapshots/phpMyAdmin-${VERSION}-all-languages.tar.gz
+ENV VERSION 4.7.4
+ENV URL https://files.phpmyadmin.net/phpMyAdmin/${VERSION}/phpMyAdmin-${VERSION}-all-languages.tar.gz
 LABEL version=$VERSION
 
 # Download tarball, verify it using gpg and extract
@@ -24,9 +24,12 @@ RUN set -x \
     && export GNUPGHOME \
     && apk add --no-cache curl gnupg \
     && curl --output phpMyAdmin.tar.gz --location $URL \
+    && curl --output phpMyAdmin.tar.gz.asc --location $URL.asc \
+    && gpgv --keyring /phpmyadmin.keyring phpMyAdmin.tar.gz.asc phpMyAdmin.tar.gz \
     && apk del --no-cache curl gnupg \
     && rm -rf "$GNUPGHOME" \
     && tar xzf phpMyAdmin.tar.gz \
+    && rm -f phpMyAdmin.tar.gz phpMyAdmin.tar.gz.asc \
     && mv phpMyAdmin-$VERSION-all-languages /www \
     && rm -rf /www/setup/ /www/examples/ /www/test/ /www/po/ /www/composer.json /www/RELEASE-DATE-$VERSION \
     && sed -i "s@define('CONFIG_DIR'.*@define('CONFIG_DIR', '/etc/phpmyadmin/');@" /www/libraries/vendor_config.php \