Revert "Use main alpine repository on PHP 8.1"

DanPeggParallax · DanPeggParallax · commit d140da29c6da · 2021-12-21T10:46:28.000Z
This reverts commit b7b8e6f.
diff --git a/php/Dockerfile-8.1 b/php/Dockerfile-8.1
@@ -55,6 +55,9 @@ ENV \
         curl \
         bash"
 
+RUN echo -n "https://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories && \
+    apk update
+
 # Install deps
 RUN apk add --no-cache \
 	curl \
