Clean up docker entrypoint script (#2217)

The .gitlab directory is no longer relevant.
This moves the entrypoint script to `rel/` directory
and copies from there.

.gitlab/build-scripts/docker.gitlab.sh

@@ -1,37 +0,0 @@
-#!/usr/bin/env bash
-
-############################
-function docker_create_config() {
-############################
-  mkdir -p /kaniko/.docker/
-  echo "###############"
-  echo "Logging into GitLab Container Registry with CI credentials for kaniko..."
-  echo "###############"
-  echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json
-  echo ""
-
-}
-
-
-############################
-function docker_build_image() {
-############################
-  if [[ -f Dockerfile ]]; then
-    echo "###############"
-    echo "Building Dockerfile-based application..."
-    echo "###############"
-
-    /kaniko/executor \
-      --cache=true \
-      --context "${CI_PROJECT_DIR}" \
-      --dockerfile "${CI_PROJECT_DIR}"/Dockerfile \
-      --destination "${CI_REGISTRY_IMAGE}:${CI_COMMIT_REF_SLUG}-${CI_COMMIT_SHORT_SHA}"  \
-      --destination "${CI_REGISTRY_IMAGE}:${CI_COMMIT_REF_SLUG}-latest"  \
-      \
-      "$@"
-
-  else
-    echo "No Dockerfile found."
-    return 1
-  fi
-}

Dockerfile

@@ -61,7 +61,7 @@ RUN apk upgrade --no-cache
 
 RUN apk add --no-cache openssl ncurses libstdc++ libgcc
 
-COPY .gitlab/build-scripts/docker-entrypoint.sh /entrypoint.sh
+COPY ./rel/docker-entrypoint.sh /entrypoint.sh
 
 RUN chmod a+x /entrypoint.sh && \
   adduser -h /app -u 1000 -s /bin/sh -D plausibleuser