docs: Change license to AGPLv3

- Add `.dockerignore` file with commonly ignored file and directory patterns
- Change software license from `MIT License` to `GNU GENERAL PUBLIC LICENSE Version 3`
- Update links in README file, changing them from plain text to clickable links
- Add an expanded explanation of GPL license requirements to the README file.

Signed-off-by: 陳鈞 <jim60105@gmail.com>

.dockerignore

@@ -0,0 +1,13 @@
+**/LICENSE
+**/*.md
+**/.hadolint.yml
+**/node_modules
+**/*.log
+**/.git
+**/.gitignore
+**/.env
+**/.github
+**/.vscode
+**/bin
+**/obj
+**/dist

.github/workflows/docker_publish.yml

@@ -66,6 +66,6 @@ jobs:
           file: ./Dockerfile
           push: true
           target: final
-          tags: ${{ steps.setup.outputs.tags }}
-          labels: ${{ steps.setup.outputs.labels }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
           platforms: linux/amd64