Add upstream check

.github/workflows/upstream_font_sync.yml

@@ -0,0 +1,20 @@
+name: Check for new upstream font data
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+  schedule:
+    - cron: '0 0 * * 0'
+jobs:
+  check_upstream_changes:
+    name: Check upstream changes
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install stable toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - uses: Check generated fonts file
+        run: ./regenerate_fonts_file_from_upstream.sh --check --hide-progress

regenerate_fonts_file_from_upstream.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -eu
+
+SCRIPTPATH=$(
+    cd "$(dirname "$(readlink -f "$0")")" || exit 1
+    pwd -P
+)
+cd "$SCRIPTPATH/tools/generate_fonts_file"
+
+TMP_DIR=$(mktemp -d)
+
+# check if tmp dir was created
+if [[ ! "$TMP_DIR" || ! -d "$TMP_DIR" ]]; then
+    echo "Could not create temp dir"
+    exit 1
+fi
+
+# Remove temp dir on exit
+function cleanup {
+    rm -rf "$TMP_DIR"
+    echo "Deleted temp working directory $TMP_DIR"
+}
+trap cleanup EXIT
+
+curl --no-progress-meter --fail-with-body --output-dir "$TMP_DIR" -O https://raw.githubusercontent.com/olikraus/u8g2/master/csrc/u8g2_fonts.c
+
+cargo run --release -- "$@" "$TMP_DIR/u8g2_fonts.c" "$SCRIPTPATH/src/fonts.rs"