fix: deprecated Dockerfile ENV syntax

Dockerfile

@@ -27,8 +27,8 @@ CMD ["--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile"]
 HEALTHCHECK CMD curl -f http://localhost:2019/metrics || exit 1
 
 # See https://caddyserver.com/docs/conventions#file-locations for details
-ENV XDG_CONFIG_HOME /config
-ENV XDG_DATA_HOME /data
+ENV XDG_CONFIG_HOME=/config
+ENV XDG_DATA_HOME=/data
 
 EXPOSE 80
 EXPOSE 443
@@ -50,7 +50,7 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 COPY --from=golang-base /usr/local/go /usr/local/go
 
-ENV PATH /usr/local/go/bin:$PATH
+ENV PATH=/usr/local/go/bin:$PATH
 
 # This is required to link the FrankenPHP binary to the PHP binary
 RUN apt-get update && \

alpine.Dockerfile

@@ -24,8 +24,8 @@ CMD ["--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile"]
 HEALTHCHECK CMD curl -f http://localhost:2019/metrics || exit 1
 
 # See https://caddyserver.com/docs/conventions#file-locations for details
-ENV XDG_CONFIG_HOME /config
-ENV XDG_DATA_HOME /data
+ENV XDG_CONFIG_HOME=/config
+ENV XDG_DATA_HOME=/data
 
 EXPOSE 80
 EXPOSE 443
@@ -47,7 +47,7 @@ SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
 
 COPY --link --from=golang-base /usr/local/go /usr/local/go
 
-ENV PATH /usr/local/go/bin:$PATH
+ENV PATH=/usr/local/go/bin:$PATH
 
 # hadolint ignore=SC2086
 RUN apk add --no-cache --virtual .build-deps \

dev-alpine.Dockerfile

@@ -2,7 +2,7 @@
 FROM golang:1.22-alpine
 
 ENV CFLAGS="-ggdb3"
-ENV PHPIZE_DEPS \
+ENV PHPIZE_DEPS="\
 	autoconf \
 	dpkg-dev \
 	file \
@@ -11,7 +11,7 @@ ENV PHPIZE_DEPS \
 	libc-dev \
 	make \
 	pkgconfig \
-	re2c
+	re2c"
 
 RUN apk add --no-cache \
 	$PHPIZE_DEPS \

dev.Dockerfile

@@ -2,7 +2,7 @@
 FROM golang:1.22
 
 ENV CFLAGS="-ggdb3"
-ENV PHPIZE_DEPS \
+ENV PHPIZE_DEPS="\
 	autoconf \
 	dpkg-dev \
 	file \
@@ -11,7 +11,7 @@ ENV PHPIZE_DEPS \
 	libc-dev \
 	make \
 	pkg-config \
-	re2c
+	re2c"
 
 # hadolint ignore=DL3009
 RUN apt-get update && \