ci: Run End-to-End Tests for Debug and Release Configurations

Motivation
----------

It looks like building images with containertool fails once the release
configuration is used.

Modifications
-------------

Update end to end and integration workflows to test both debug and release
configurations.

Result
------

End-to-End Tests will now fail in release configuration.

Test Plan
---------

Other tests are not affected by this.

Author: herzi

.github/workflows/endtoend_tests.yml

@@ -21,6 +21,9 @@ jobs:
                     - 5000:5000
         strategy:
             matrix:
+                configuration:
+                    - debug
+                    - release
                 example:
                     - Examples/HelloWorldVapor
                     - Examples/HelloWorldHummingbird
@@ -47,6 +50,7 @@ jobs:
                   cat ${{ matrix.example }}/Package.swift
                   swift package \
                       --package-path ${{ matrix.example }} \
+                      --configuration ${{ matrix.configuration }} \
                       -Xswiftc -warnings-as-errors \
                       --swift-sdk x86_64-swift-linux-musl \
                       --allow-network-connections all \