Add optimisations to dockerfile (#4191)

Separate and delete build dependencies, add .dockerignore file

Author: featdd

.dockerignore

@@ -0,0 +1,4 @@
+*
+!.dockerignore
+!Dockerfile
+!deployer.phar

.github/workflows/docker.yaml

@@ -69,5 +69,7 @@ jobs:
           platforms: linux/amd64,linux/arm64
           push: true
           provenance: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -1,8 +1,19 @@
 FROM php:8.4-cli-alpine
 
-RUN apk update && apk add --no-cache linux-headers bash git openssh-client rsync zip unzip libzip-dev curl-dev
-
-RUN docker-php-ext-install pcntl sockets curl zip
+RUN set -eux; \
+    apk add --no-cache \
+        bash \
+        git \
+        libzip \
+        openssh-client \
+        rsync \
+        unzip \
+        zip; \
+    apk add --no-cache --virtual .build-deps \
+        libzip-dev \
+        linux-headers; \
+    docker-php-ext-install -j"$(nproc)" pcntl sockets zip; \
+    apk del .build-deps
 
 COPY --chmod=755 deployer.phar /bin/dep