Dockerfile: update keys

Dockerfile

@@ -9,13 +9,17 @@ RUN sed -f docker/erlang.config.sed priv/erlang.config.in > /etc/zotonic/erlang.
     && adduser -S -h /tmp -H -D zotonic \
     && chown -R zotonic /opt/zotonic/priv
 
+# Fix for untrusted keys https://gitlab.alpinelinux.org/alpine/aports/-/issues/14043
+RUN apk upgrade
+RUN apk add -X https://dl-cdn.alpinelinux.org/alpine/v3.16/main -u alpine-keys
+
 # Note: dumb-init and gosu are pulled from edge; remove that when upgrading to an alpine release that
 # includes those packages.
 ENV BUILD_APKS="ca-certificates wget curl make gcc musl-dev g++ git"
 RUN apk add --no-cache --virtual build-deps $BUILD_APKS \
     && apk add --no-cache bash bsd-compat-headers file imagemagick openssl \
-    && apk add --no-cache --repository http://dl-3.alpinelinux.org/alpine/edge/community/ dumb-init \
-    && apk add --no-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ gosu \
+    && apk add --no-cache --repository https://dl-cdn.alpinelinux.org/alpine/edge/community/ dumb-init \
+    && apk add --no-cache --repository https://dl-cdn.alpinelinux.org/alpine/edge/testing/ gosu \
     && DEBUG=1 make \
     && apk del build-deps