fix os.version shim, improve docker image

scripts/entrypoint.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+set -e
+
+OBSIDIAN_DIR="/app/obsidian-app"
+OBSIDIAN_VERSION="${OBSIDIAN_VERSION:-1.12.4}"
+
+if [ ! -f "$OBSIDIAN_DIR/index.html" ]; then
+  echo "[ignis] First run. Downloading Obsidian v${OBSIDIAN_VERSION}..."
+
+  curl -fSL "https://github.com/obsidianmd/obsidian-releases/releases/download/v${OBSIDIAN_VERSION}/obsidian_${OBSIDIAN_VERSION}_amd64.deb" \
+    -o /tmp/obsidian.deb
+
+  echo "[ignis] Extracting .deb..."
+  mkdir -p /tmp/obsidian-deb /tmp/obsidian-pkg
+  ar x /tmp/obsidian.deb --output=/tmp/obsidian-deb
+  tar -xf /tmp/obsidian-deb/data.tar.xz -C /tmp/obsidian-pkg
+
+  echo "[ignis] Unpacking asar..."
+  npx --yes @electron/asar extract \
+    /tmp/obsidian-pkg/opt/Obsidian/resources/obsidian.asar \
+    "$OBSIDIAN_DIR"
+
+  echo "[ignis] Patching..."
+  node /app/scripts/patch-obsidian.js "$OBSIDIAN_DIR"
+
+  cp /app/dist/shim-loader.js "$OBSIDIAN_DIR/shim-loader.js"
+  cp /app/images/favicon.png "$OBSIDIAN_DIR/favicon.png"
+
+
+  rm -rf /tmp/obsidian.deb /tmp/obsidian-deb /tmp/obsidian-pkg
+
+  echo "[ignis] Obsidian v${OBSIDIAN_VERSION} ready."
+else
+  echo "[ignis] Obsidian already set up."
+fi
+
+exec node /app/server/index.js