Fixes skupperproject#655 - Upgrade container image to Proton main (pr…

…e 0.38.0) (skupperproject#666)

Replaces the Apache Proton URL with GitHub archive URL.

Containerfile

@@ -30,8 +30,8 @@ RUN microdnf -y --setopt=install_weak_deps=0 --setopt=tsflags=nodocs install \
 
 WORKDIR /build
 COPY . .
-ENV PROTON_VERSION=0.37.0
-ENV PROTON_SOURCE_URL=${PROTON_SOURCE_URL:-http://archive.apache.org/dist/qpid/proton/${PROTON_VERSION}/qpid-proton-${PROTON_VERSION}.tar.gz}
+ENV PROTON_VERSION=main
+ENV PROTON_SOURCE_URL=${PROTON_SOURCE_URL:-https://github.com/apache/qpid-proton/archive/refs/heads/${PROTON_VERSION}.tar.gz}
 ENV LWS_VERSION=v4.3.1
 ENV LWS_SOURCE_URL=${LWS_SOURCE_URL:-https://github.com/warmcat/libwebsockets/archive/refs/tags/${LWS_VERSION}.tar.gz}