ci: Update some docker settings

.gitlab-ci.yml

@@ -21,18 +21,20 @@ variables:
   variables:
     # Docker in Docker:
     DOCKER_BUILDKIT: 1
+    DOCKER_TLS_CERTDIR: "/certs"
   image:
     name: docker.io/docker
   services:
     - name: docker.io/docker:dind
       alias: docker
   script:
+    - docker context create ci-context
     - >
       docker buildx create
       --name "multi"
       --driver "docker-container"
-      --platform "linux/arm64,linux/arm/v7"
-      --use
+      --platform "linux/arm64,linux/arm/v7,linux/amd64"
+      --use ci-context
     # Authorize against this project's own image registry:
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
     # Build multiplatform image and push to temporary tag:
@@ -40,6 +42,9 @@ variables:
       docker buildx build 
       --platform "linux/arm/v7,linux/arm64,linux/amd64"
       --pull
+      --cache-from=type=registry,ref=$CI_REGISTRY_IMAGE/$TAG
+      --cache-from=type=registry,ref=$CI_REGISTRY_IMAGE/matrix-conduit:next
+      --ulimit nofile=2048
       --tag "$CI_REGISTRY_IMAGE/temporary-ci-images:$CI_JOB_ID"
       --push
       --provenance=false
@@ -48,6 +53,7 @@ variables:
     - >
       docker buildx build 
       --platform "linux/arm/v7,linux/arm64,linux/amd64"
+      --ulimit nofile=2048
       --target "packager-result"
       --output="type=local,dest=/tmp/build-output"
       --provenance=false
@@ -56,6 +62,7 @@ variables:
     - >
       docker buildx build 
       --platform "linux/arm/v7,linux/arm64,linux/amd64"
+      --ulimit nofile=2048
       --target "builder-result"
       --output="type=local,dest=/tmp/build-output"
       --provenance=false