test(e2e): add composer/maven/nuget Dockerfiles

Adds the three Dockerfile recipes the docker_e2e_{composer,maven,nuget}
tests panic-message instruct users to build.

- Dockerfile.composer: base + PHP 8 + Composer 2
- Dockerfile.maven:    base + default-jdk-headless + maven
- Dockerfile.nuget:    mcr.microsoft.com/dotnet/sdk:8.0 (sdk image)
                       with socket-patch COPY'd in from the base

Author: mikolalysenko

tests/docker/Dockerfile.composer

@@ -0,0 +1,13 @@
+# composer (PHP) ecosystem test image: base + PHP + Composer.
+FROM socket-patch-test-base:latest
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+      php-cli \
+      php-curl \
+      php-xml \
+      php-mbstring \
+      unzip \
+ && rm -rf /var/lib/apt/lists/* \
+ && curl -fsSL https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer \
+ && php --version && composer --version

tests/docker/Dockerfile.maven

@@ -0,0 +1,9 @@
+# maven ecosystem test image: base + JDK + Maven.
+FROM socket-patch-test-base:latest
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+      default-jdk-headless \
+      maven \
+ && rm -rf /var/lib/apt/lists/* \
+ && java -version && mvn -version

tests/docker/Dockerfile.nuget

@@ -0,0 +1,12 @@
+# nuget (.NET) ecosystem test image.
+#
+# The official `mcr.microsoft.com/dotnet/sdk:8.0` image is the simplest
+# way to get a working .NET SDK across architectures (the apt + dotnet-
+# install paths both have arm64 issues on bookworm). We COPY socket-patch
+# in from our base image.
+FROM socket-patch-test-base:latest AS sptool
+
+FROM mcr.microsoft.com/dotnet/sdk:8.0
+COPY --from=sptool /usr/local/bin/socket-patch /usr/local/bin/socket-patch
+RUN socket-patch --version && dotnet --version
+WORKDIR /workspace