use local git repo - basic features seem to work

Dockerfile

@@ -1,7 +1,7 @@
 FROM node:22-alpine AS base
 
 RUN corepack enable
-RUN apk add --no-cache libc6-compat
+RUN apk add --no-cache libc6-compat git
 
 # --- Dependencies stage ---
 FROM base AS deps
@@ -41,6 +41,14 @@ COPY --from=builder /app/public ./public
 COPY --from=builder /app/content ./content
 COPY --from=builder /app/tina ./tina
 
+# Initialize a local git repo for IsomorphicBridge
+# IsomorphicBridge requires a .git directory with at least one commit
+RUN git init && \
+    git config user.email "cms@linumiq.com" && \
+    git config user.name "TinaCMS" && \
+    git add -A && \
+    git commit -m "Initial content"
+
 # Copy the startup indexing script
 COPY --from=builder /app/scripts/index-database.mjs ./scripts/index-database.mjs
 
@@ -48,7 +56,9 @@ COPY --from=builder /app/scripts/index-database.mjs ./scripts/index-database.mjs
 COPY --from=builder /app/.next/static/pagefind ./.next/static/pagefind
 
 # Create cache directory with correct permissions
-RUN mkdir -p .next/cache && chown -R nextjs:nodejs .next/cache
+# IsomorphicBridge needs write access to .git and content for commits
+RUN mkdir -p .next/cache && \
+    chown -R nextjs:nodejs .next/cache .git content tina
 
 USER nextjs