feat: Add better tooling and CI

- Improve the build of the image by introducing `build.sh`.
  It can be used with `podman` or `buildah` and
  also provides a way of building a `dev` or `prod`
  image for development purposes by
  `build.sh [dev|prod]`.

- CI runs this script as well with `buildah`.

Signed-off-by: Gabriel Nützi <gnuetzi@gmail.com>

.gitlab-ci.yml

@@ -1,5 +1,4 @@
 ---
-
 default:
   image: quay.io/buildah/stable:v1.32
   tags:
@@ -30,7 +29,7 @@ commit_check:
     - if: $CI_PIPELINE_SOURCE == "merge_request_event"
     - when: never
   variables:
-    BADRX: '^(squash!)|(fixup!)'
+    BADRX: "^(squash!)|(fixup!)"
   script: |
     dnf install -y git
     shortlogtmp=$(mktemp -p '' commit_check_tmp_XXXX)
@@ -51,23 +50,4 @@ build:
   before_script:
     - echo "$CI_REGISTRY_PASSWORD" | buildah login -u "$CI_REGISTRY_USER" --password-stdin $CI_REGISTRY
   script:
-    # N/B: There could be more than one merge-request open with this branch's HEAD
-    - |
-        IMAGE_TAG="${CI_COMMIT_REF_SLUG}";
-        if [[ -n "$CI_COMMIT_TAG" ]]; then
-            IMAGE_TAG="${CI_COMMIT_TAG}";
-        elif [[ -n "$CI_OPEN_MERGE_REQUESTS" ]]; then
-            IMAGE_TAG=mr$(echo "${CI_OPEN_MERGE_REQUESTS}" | cut -d, -f -1 | cut -d\! -f 2);
-        elif [[ "$CI_COMMIT_BRANCH" == "main" ]]; then
-            IMAGE_TAG="latest";
-        fi
-        echo "Building/Pushing to: ${CI_REGISTRY_IMAGE}:${IMAGE_TAG}";
-    - >-
-      buildah build \
-        --label "org.opencontainers.image.source=${CI_PROJECT_URL}" \
-        --label "org.opencontainers.image.revision=$CI_COMMIT_SHA" \
-        --label "org.opencontainers.image.created=$CI_JOB_STARTED_AT" \
-        --label "org.opencontainers.image.version=${IMAGE_TAG}" \
-        -t "${CI_REGISTRY_IMAGE}:${IMAGE_TAG}" "$CI_PROJECT_DIR"
-    - buildah images
-    - buildah push "${CI_REGISTRY_IMAGE}:${IMAGE_TAG}"
+    - scripts/build.sh