docs: add release process documentation

It is easier to read the doc rather than jump around
github actions

Signed-off-by: Pavel Abramov <uncle.decart@gmail.com>

docs/release.md

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+# Automated Release Process Documentation
+
+This document outlines the automated release process for the repository. Using GitHub Actions, we ensure consistent tagging, building, and publishing of artifacts to DockerHub and GHCR.
+You can find workflows under `.github` directory
+
+
+## Release Workflow Overview
+
+The GitHub Actions workflow automatically:
+
+- Builds Docker images for the release artifact in format v.X.Y.Z
+- Publishes the images to:
+  - DockerHub
+  - GitHub Container Registry (GHCR)
+
+## Automated Tagging and Publishing
+
+1. Version Tagging
+
+- Release tags follow the format vX.Y.Z, where:
+  - X.Y are the major and minor versions.
+  - Z is the iteration derived from the master branch.
+- Tags are automatically generated and pushed to the repository.
+
+2. Build and Publish Workflow
+
+The GitHub Actions workflow:
+
+- Detects the creation of a new tag (v*).
+- Builds the Docker image for the tagged version.
+- Pushes the image to both DockerHub and GHCR.
+
+## Key Notes
+
+### Secrets Configuration
+
+DockerHub Credentials: Add the following secrets to your repository:
+- RELEASE_DOCKERHUB_ACCOUNT
+- RELEASE_DOCKERHUB_TOKEN
+
+GitHub Token: Ensure GITHUB_TOKEN is available for pushing to GHCR.
+
+Triggering the Release Workflow
+
+- Create a new tag in the repository using the vX.Y.Z format:
+    - git tag -a v0.0.57 -m "Release version 0.0.57"
+    - git push origin v0.0.57
+
+The workflow will automatically start upon detecting the tag.
+
+## Verifying the Release
+
+- DockerHub: Verify the image is listed under adam DockerHub repository: https://hub.docker.com/r/lfedge/adam
+- GHCR: Verify the image is listed in the GitHub Packages section of adam repository: https://github.com/lf-edge/adam/packages