Add pixelfed build script

pixelfed/Dockerfile

@@ -82,7 +82,7 @@ RUN set -ex; \
 
 RUN rm -r /scratch
 
-ENV TAG=dev
+ENV TAG=VERSION
 
 RUN set -ex; \
         fetchDeps=git; \

pixelfed/build.sh

@@ -0,0 +1,42 @@
+#!/usr/bin//env bash
+
+TAG=$1
+
+function require() {
+	if [ "$1" = "" ]; then
+		echo "input '$2' required"
+		print_help
+		exit 1
+	fi
+}
+
+function print_help() {
+	echo "build.sh"
+	echo ""
+	echo "Usage:"
+	echo "	build.sh [tag]"
+	echo ""
+	echo "Args:"
+	echo "		tag: The tag of the pixelfed image the target image is based on"
+}
+
+require "$TAG" tag
+
+set -xe
+
+sed "s/VERSION/$TAG/g" Dockerfile > "Dockerfile.$TAG"
+
+docker build \
+	--pull \
+	--no-cache \
+	-f "Dockerfile.$TAG" \
+	-t "asonix/pixelfed:$TAG-arm64v8" \
+	-t asonix/pixelfed:latest-arm64v8 \
+	-t asonix/pixelfed:latest \
+	.
+
+docker push "asonix/pixelfed:$TAG-arm64v8"
+docker push asonix/pixelfed:latest-arm64v8
+docker push asonix/pixelfed:latest
+
+rm "Dockerfile.$TAG"