Downgrade to PHP 8

.docker/php80/Dockerfile

@@ -0,0 +1,22 @@
+# ----------------------
+# The FPM base container
+# ----------------------
+FROM php:8.0-cli-alpine AS dev
+
+RUN apk add --no-cache --virtual .build-deps \
+    $PHPIZE_DEPS
+
+# Cleanup apk cache and temp files
+RUN rm -rf /var/cache/apk/* /tmp/*
+
+# ----------------------
+# Composer install step
+# ----------------------
+
+# Get latest Composer
+COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
+
+# ----------------------
+# The FPM production container
+# ----------------------
+FROM dev

.github/workflows/tests.yml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
-        php: [8.3, 8.2, 8.1]
+        php: [8.3, 8.2, 8.1, 8.0]
         dependency-version: [prefer-lowest, prefer-stable]
 
     name: P${{ matrix.php }} - ${{ matrix.dependency-version }} - ${{ matrix.os }}

docker-compose.yml

@@ -1,5 +1,16 @@
 services:
-  php74:
+  php80:
+    container_name: php-open-tsdb-client-lib-80
+    image: php-open-tsdb-client-lib-80
+    build:
+      context: ./
+      dockerfile: ./.docker/php80/Dockerfile
+    tty: true
+    working_dir: /app
+    volumes:
+      - ./:/app
+
+  php81:
     container_name: php-open-tsdb-client-lib-81
     image: php-open-tsdb-client-lib-81
     build:

src/DataPoint.php

@@ -27,10 +27,10 @@ final class DataPoint implements
      * @param array<string, string> $tags A map of tag name/tag value pairs. At least one pair must be supplied.
      */
     public function __construct(
-        private readonly string $metric,
-        private readonly int $timestamp,
-        private readonly int | float | string $value,
-        private readonly array $tags,
+        private string $metric,
+        private int $timestamp,
+        private int | float | string $value,
+        private array $tags,
     ) {
         // TODO: Assert at least one tag value pair supplied
     }

src/OpenTsdbClient.php

@@ -20,8 +20,8 @@
 final class OpenTsdbClient
 {
     public function __construct(
-        private readonly ClientInterface $httpClient,
-        private readonly string $baseUri,
+        private ClientInterface $httpClient,
+        private string $baseUri,
     ) {}
 
     /**