feat:#72 add footer and commit id injection

frontend/vite.config.ts

@@ -23,9 +23,18 @@ import terser from "@rollup/plugin-terser";
 import generateSitemap from "vite-ssg-sitemap";
 import vueDevTools from "vite-plugin-vue-devtools";
 import { ViteSSGOptions } from "vite-ssg";
+import fs from "fs";
 
 const hostname = "https://cal.htwk-leipzig.de";
 
+// fallback
+let commitHash = "unknown"
+if (fs.existsSync('.env.commit')) {
+  const env = fs.readFileSync('.env.commit', 'utf-8')
+  const match = env.match(/COMMIT_HASH=(.+)/)
+  if (match) commitHash = match[1]
+}
+
 // https://vitejs.dev/config/
 export default defineConfig({
   plugins: [vue(), resolve(), terser(), vueDevTools()],
@@ -45,6 +54,9 @@ export default defineConfig({
       ".scss",
     ],
   },
+  define: {
+    __COMMIT_HASH__: JSON.stringify(commitHash),
+  },
   ssgOptions: <ViteSSGOptions>{
     script: "async",
     formatting: "minify",