Add rdkafka extension (#256)

layers/rdkafka/Dockerfile

@@ -0,0 +1,40 @@
+ARG PHP_VERSION
+FROM bref/build-php-$PHP_VERSION:1.1.4 AS ext
+
+ENV LIBRDKAFKA_BUILD_DIR=${BUILD_DIR}/librdkafka
+
+RUN set -xe; \
+    mkdir -p ${LIBRDKAFKA_BUILD_DIR}; \
+    # Download and upack the source code
+    curl -Ls  https://github.com/edenhill/librdkafka/archive/refs/tags/v1.7.0.tar.gz   \
+    | tar xzC ${LIBRDKAFKA_BUILD_DIR}
+
+# Move into the unpackaged code directory
+WORKDIR  ${LIBRDKAFKA_BUILD_DIR}/librdkafka-1.7.0/
+
+# Install
+RUN set -xe; \
+    ./configure --prefix=${INSTALL_DIR} && \
+    make && \
+    make install
+
+RUN pecl install --onlyreqdeps --nobuild rdkafka && \
+    cd "$(pecl config-get temp_dir)/rdkafka" && \
+    phpize && \
+    ./configure --with-rdkafka=${INSTALL_DIR} && \
+    make && \
+    make install  && \
+    cd -
+
+RUN cp /opt/bref/lib/php/extensions/no-debug-non-zts-*/rdkafka.so /tmp/rdkafka.so
+RUN echo 'extension=/opt/bref-extra/rdkafka.so' > /tmp/ext.ini
+
+
+# Build the final image with just the files we need
+FROM scratch
+
+# Copy things we installed to the final image
+COPY --from=ext /tmp/rdkafka.so /opt/bref-extra/rdkafka.so
+COPY --from=ext /tmp/ext.ini /opt/bref/etc/php/conf.d/ext-rdkafka.ini
+COPY --from=ext /opt/bref/lib/librdkafka* /opt/bref/lib/
+COPY --from=ext /opt/bref/include/librdkafka /opt/bref/include/

layers/rdkafka/config.json

@@ -0,0 +1,7 @@
+{
+    "php": [
+        "73",
+        "74",
+        "80"
+    ]
+}

layers/rdkafka/test.php

@@ -0,0 +1,8 @@
+<?php
+
+if (!class_exists($class = RdKafka\KafkaConsumer::class)) {
+    echo sprintf('FAIL: Class "%s" does not exist.', $class).PHP_EOL;
+    exit(1);
+}
+
+exit(0);