fix(httpie): do not fail the build if httpie fails to install

Failures can happen if pip.conf isn't available and security settings
like proxies are required. Now we will just skip the install.

CHANGELOG.md

@@ -24,6 +24,10 @@
 
 ## unreleased
 
+* Fix: do not fail the build if httpie cannot be installed. Now continues the
+  build since it is optional.
+  [#515](https://github.com/Kong/kong-pongo/pull/515).
+
 * Fix: the --debug option will now output full buildlogs again using buildkit
   [#513](https://github.com/Kong/kong-pongo/pull/513).
 

assets/Dockerfile

@@ -48,7 +48,7 @@ ARG ftp_proxy
 RUN apt update \
     && apt install -y zip make jq m4 curl build-essential wget git libssl-dev zlib1g-dev lsb-release psmisc net-tools
 RUN /pongo/install-python.sh
-RUN pip3 install httpie
+RUN pip3 install httpie || echo -e "\n\n\nFailed installing httpie, continuing without.\n\n\n"
 RUN curl -k -s -S -L https://github.com/fullstorydev/grpcurl/releases/download/v1.7.0/grpcurl_1.7.0_linux_x86_64.tar.gz | tar xz -C /kong/bin
 RUN cd /kong \
     && git config --global url.https://github.com/.insteadOf git://github.com/ \