feat: Add litmus test image with current PHP version (8.3)

Signed-off-by: Ferdinand Thiessen <[email protected]>

Author: susnux

integration-php8.3/Dockerfile

@@ -0,0 +1,6 @@
+FROM ghcr.io/nextcloud/continuous-integration-php8.3:latest
+
+RUN mkdir /tmp/server && \
+    cd /tmp/server && git clone --recursive https://github.com/nextcloud/server.git && \
+    cd /tmp/server/server/build/integration && composer install && \
+    rm -rf /tmp/server

litmus-php8.3/Dockerfile

@@ -0,0 +1,8 @@
+FROM ghcr.io/nextcloud/continuous-integration-php8.3:latest
+
+RUN apt-get update && apt-get install -y gcc coreutils make python && \
+    mkdir -p /tmp/litmus && \
+    wget -O /tmp/litmus/litmus-0.13.tar.gz http://www.webdav.org/neon/litmus/litmus-0.13.tar.gz && \
+    cd /tmp/litmus && tar -xzf litmus-0.13.tar.gz && \
+    cd /tmp/litmus/litmus-0.13 && ./configure && make && rm -f /tmp/litmus-0.13.tar.gz && \
+    apt-get clean