docs: update AGENTS.md and 05-deploy.md for clarity and additional instructions

Author: ivictbor

AGENTS.md

@@ -183,7 +183,7 @@ For impossible states, prefer failing loudly in development rather than hiding t
 
 ---
 
-## Code review rules for agents
+## Code rules for agents
 
 Before writing extra guards, ask:
 

adminforth/documentation/docs/tutorial/05-deploy.md

@@ -19,6 +19,7 @@ You can use it to build your AdminForth application in Docker container.
 > at build time. If you will remove it, your AdminForth application will still work, but will cause some downtime during app restart/redeploy because bundling will happen at runtime after you start the `index.ts` file. When `npx adminforth bundle` command is executed at build time, the call do `bundleNow()` inside of `index.ts` file will actually do nothing.
 
 
+
 ## Building the image
 
 Now you can build your image:
@@ -41,6 +42,33 @@ docker run -p 3500:3500 \
 
 Now open your browser and go to `http://localhost:3500` to see your AdminForth application running in Docker container.
 
+
+## Reducing docker image build time
+
+By default `Dockerfile` created by adminforth CLI is configured in a way to rebuild adminforth SPA from scratch on every build:
+
+```
+RUN pnpm/npm adminforth bundle
+```
+
+If you want to speed up your build, you can use Docker cache for /tmp folder and change this line to:
+
+```
+RUN --mount=type=cache,target=/tmp pnpm/npm adminforth bundle
+```
+
+This will cache all /tmp folder between builds and speed up the build process significantly. However you need to ensure that your build daemon persists cache from `--mount=type=cache` mounts. Most of vendor CI build daemons like Github actions Default runner will not persist cache between builds so adding `--mount=type=cache` will not help in such case and you need to use dedicated caching solutions.
+
+To verify build performance locally you can do next:
+1) Modify any custom vue file
+2) Run `docker build -t myadminapp .`. This populates docker cache with bundled SPA
+3) Modify same cusom vue file again
+4) Run `time docker build -t myadminapp .` and check resulting time.
+
+First we recommend repeat steps 1-4 without `--mount=type=cache` on your docker daemon to see how much time it takes to build without cache and then add `--mount=type=cache` and repeat steps 1-4 again to see the difference in build times. Then experiment with your CI caching solution to achieve similar build times.
+
+
+
 ## Automating deployments with CI
 
 If you are looking for a professional way to deploy your AdminForth application, you can follow our blog post [how to deploy your AdminForth application with Terraform From GitHub actions](https://adminforth.dev/blog/compose-aws-ec2-ecr-terraform-github-actions/)