Separate base image

Base.Dockerfile

@@ -0,0 +1,31 @@
+FROM alpine:3.14 AS builder
+
+ARG PHP_VERSION
+
+WORKDIR /usr/src/php
+
+RUN wget -q https://github.com/php/php-src/archive/refs/tags/php-${PHP_VERSION}.tar.gz \
+    && tar --strip-components 1 -xzf php-${PHP_VERSION}.tar.gz \
+    && rm php-${PHP_VERSION}.tar.gz
+
+RUN apk add --no-cache \
+        alpine-sdk \
+        autoconf \
+        automake \
+        libc6-compat \
+        libtool \
+    && apk add --no-cache \
+        bison \
+        re2c \
+    && ./buildconf --force
+
+RUN ./configure --disable-all \
+        --disable-cgi \
+        --disable-debug --disable-phpdbg \
+        --with-config-file-path="/usr/local/etc/php" \
+        --with-config-file-scan-dir="/usr/local/etc/php/conf.d" \
+        CFLAGS="-O3 -march=native" \
+    && sed -i 's/-export-dynamic/-all-static/g' Makefile
+
+RUN make \
+    && make install

Dockerfile

@@ -1,41 +1,13 @@
-FROM alpine:3.14 AS builder
+ARG DOCKER_IMAGE_TAG
 
-ARG PHP_VERSION
-
-WORKDIR /usr/src/php
-
-RUN wget -q https://github.com/php/php-src/archive/refs/tags/php-${PHP_VERSION}.tar.gz \
-    && tar --strip-components 1 -xzf php-${PHP_VERSION}.tar.gz \
-    && rm php-${PHP_VERSION}.tar.gz
-
-RUN apk add --no-cache \
-        alpine-sdk \
-        autoconf \
-        automake \
-        libc6-compat \
-        libtool \
-    && apk add --no-cache \
-        bison \
-        re2c \
-    && ./buildconf --force
-
-RUN ./configure --disable-all \
-        --disable-cgi \
-        --disable-debug --disable-phpdbg \
-        --with-config-file-path="/usr/local/etc/php" \
-        --with-config-file-scan-dir="/usr/local/etc/php/conf.d" \
-        CFLAGS="-O3 -march=native" \
-    && sed -i 's/-export-dynamic/-all-static/g' Makefile
-
-RUN make \
-    && make install
+FROM ${DOCKER_IMAGE_TAG} AS base
 
 RUN apk add --no-cache upx \
     && upx --best /usr/local/bin/php
 
 FROM scratch
 
-COPY --from=builder /usr/local/bin/php /usr/local/bin/php
+COPY --from=base /usr/local/bin/php /usr/local/bin/php
 
 ENTRYPOINT ["/usr/local/bin/php"]
 

Makefile

@@ -4,13 +4,19 @@ PHP_VERSION=8.0.9
 .PHONY: all
 all: build
 
+.PHONY: base
+base:
+	docker build . \
+		--file Base.Dockerfile \
+		--build-arg PHP_VERSION=${PHP_VERSION} \
+		--tag wandersonwhcr/php-smallest:${GIT_SHA_SHORT}-base
+
 .PHONY: build
-build:
+build: base
 	docker build . \
 		--file Dockerfile \
-		--build-arg PHP_VERSION=${PHP_VERSION} \
+		--build-arg DOCKER_IMAGE_TAG=wandersonwhcr/php-smallest:${GIT_SHA_SHORT}-base \
 		--tag wandersonwhcr/php-smallest:${GIT_SHA_SHORT}
-	docker tag wandersonwhcr/php-smallest:${GIT_SHA_SHORT} wandersonwhcr/php-smallest:latest
 
 .PHONY: size
 size: build