ci: add gitlab ci for docker compose

- split into multiple jobs
- specify tags for runner large
- use buildx and add separate builder default has no cache
- build image from cache and push to registry
- compose use tag and pull
- use cache tag for reuse
- https://github.com/moby/buildkit/issues/1981
- https://github.com/moby/buildkit/issues/3730
- use cache-to and cache-from with registry/cache
- add dockerignore to prevent rebuild on git changes
- use individual builders
- add step for docker compose up
- update readme
- update dockerignore
- add gitignore
- use script reduce duplicate code
- cache from and to in build, compose use cache
- dont push images just use cache
- build in compose step from cache
Signed-off-by: Lakshya Singh <lakshay.singh1108@gmail.com>

.gitlab-ci.yml

@@ -0,0 +1,57 @@
+stages:
+  - build
+  - test
+
+default:
+  image: docker:24.0.7
+  services:
+    - docker:24.0.7-dind
+  before_script:
+  - docker version
+  - docker compose version
+  - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+
+variables:
+  VLS_CONTAINER_REGISTRY: $CI_REGISTRY/$CI_PROJECT_NAMESPACE/$CI_PROJECT_NAME
+  CACHE: $CI_REGISTRY_IMAGE/cache
+  CACHE_TAG: $CI_COMMIT_REF_SLUG
+  IMAGE_TAG: $CI_COMMIT_SHA
+
+build_bitcoin:
+  tags: [ saas-linux-large-amd64 ]
+  stage: build
+  script:
+    - ./scripts/build_image_cache.sh bitcoind
+build_core_lightning:
+  tags: [ saas-linux-large-amd64 ]
+  stage: build
+  script:
+    - ./scripts/build_image_cache.sh lightningd
+build_txoo:
+  tags: [ saas-linux-medium-amd64 ]
+  stage: build
+  script:
+    - ./scripts/build_image_cache.sh txood
+build_vls:
+  tags: [ saas-linux-large-amd64 ]
+  stage: build
+  script:
+    - ./scripts/build_image_cache.sh vlsd
+compose:
+  tags: [ saas-linux-medium-amd64 ]
+  stage: test
+  variables:
+    BUILDER: compose_builder
+  before_script:
+    - docker volume create bitcoin_data
+    - docker volume create lightning_data
+    - docker volume create txoo_data
+    - docker volume create vls_data
+    - docker buildx create --name=$BUILDER --use
+  script:
+    - echo "IMAGE_TAG=${IMAGE_TAG}" > .env
+    - ./scripts/build_from_cache.sh bitcoind
+    - ./scripts/build_from_cache.sh lightningd
+    - ./scripts/build_from_cache.sh txood
+    - ./scripts/build_from_cache.sh vlsd
+    - docker compose --profile vls up -d --wait --wait-timeout 120 --build