try to spiff up the CI build

.gitlab-ci.yml

@@ -20,6 +20,7 @@ push:
   script:
     - mkdir ~/.docker
     - echo "$DOCKER_AUTH_CONFIG" > ~/.docker/config.json
+    - sh build/ci/ci.sh publish
     - >
       docker build 
       --tag ghcr.io/dirtbags/moth:$CI_COMMIT_REF_SLUG

build/ci/ci.sh

@@ -0,0 +1,42 @@
+#! /bin/sh
+
+set -e
+
+ACTION=$1
+BASE=$2
+if [ -z "$ACTION" ] || [ -z "$BASE" ]; then
+    echo "Usage: $0 ACTION BASE"
+    exit 1
+fi
+
+log () {
+    printf "=== %s\n" "$*" 1>&2
+}
+
+fail () {
+    printf "\033[31;1m=== FAIL: %s\033[0m\n" "$*" 1>&2
+    exit 1
+}
+
+tags () {
+    pfx=$1
+    for base in ghcr.io/dirtbags/moth dirtbags/moth; do
+        echo $pfx $base:${CI_COMMIT_REF_SLUG}
+        echo $pfx $base:${CI_COMMIT_REF_SLUG%.*}
+        echo $pfx $base:${CI_COMMIT_REF_SLUG%.*.*}
+    done | uniq
+}
+
+case $ACTION in
+    publish)
+        docker build \
+            --file build/package/Containerfile \
+            $(tags)
+        docker push $(tags --destination)
+    ;;
+*)
+    echo "Unknown action: $1" 1>&2
+    exit 1
+    ;;
+esac
+