Create a layer for the opentelemetry php extension

layers/opentelemetry/Dockerfile

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+ARG PHP_VERSION
+ARG BREF_VERSION
+FROM bref/build-php-$PHP_VERSION:$BREF_VERSION AS ext
+
+RUN pecl install opentelemetry-1.0.0 > /dev/null
+RUN cp `php-config --extension-dir`/opentelemetry.so /tmp/opentelemetry.so
+RUN strip --strip-debug /tmp/opentelemetry.so
+RUN echo 'extension=opentelemetry.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/opentelemetry.so /opt/bref/extensions/opentelemetry.so
+COPY --from=ext /tmp/ext.ini /opt/bref/etc/php/conf.d/ext-opentelemetry.ini

layers/opentelemetry/config.json

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+{
+    "php": [
+        "80",
+        "81",
+        "82"
+    ]
+}

layers/opentelemetry/test.php

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+<?php
+
+if (!function_exists($function = "OpenTelemetry\Instrumentation\hook")) {
+    echo sprintf('FAIL: Function "%s" does not exist.', $function) . PHP_EOL;
+    exit(1);
+}
+
+exit(0);