build: add alpine support to matrix builds (#1349)

build/alpine/install-packages.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+set -e
+
+apk add --no-cache -U \
+    openssl \
+    imagemagick \
+    file \
+    lsof \
+    su-exec \
+    coreutils \
+    findutils \
+    shadow \
+    bash \
+    curl iputils \
+    git \
+    jq \
+    mysql-client \
+    tzdata \
+    rsync \
+    nano \
+    sudo \
+    knock \
+    ttf-dejavu \
+    tar \
+    zstd

build/alpine/setup-user.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+set -e
+
+addgroup -g 1000 minecraft
+adduser -Ss /bin/false -u 1000 -G minecraft -h /home/minecraft minecraft