feat(pkgmgr): add slim Docker image target and publish slim variants

- add dedicated `slim` Dockerfile stage based on `full`
- move image cleanup into slim stage via slim.sh
- extend build script to support `--target slim`
- publish pkgmgr-*-slim images for all distros

https://chatgpt.com/share/69701a4e-b000-800f-be7e-162dcb93b1d2

scripts/build/image.sh

@@ -33,7 +33,7 @@ Usage: PKGMGR_DISTRO=<distro> $0 [options]
 Build options:
   --missing             Build only if the image does not already exist (local build only)
   --no-cache            Build with --no-cache
-  --target <name>       Build a specific Dockerfile target (e.g. virgin)
+  --target <name>       Build a specific Dockerfile target (e.g. virgin, slim)
   --tag <image>         Override the output image tag (default: ${default_tag})
 
 Publish options:
@@ -47,7 +47,7 @@ Publish options:
 
 Notes:
 - --publish implies --push and requires --registry, --owner, and --version.
-- Local build (no --push) uses "docker build" and creates local images like "pkgmgr-arch" / "pkgmgr-arch-virgin".
+- Local build (no --push) uses "docker build" and creates local images like "pkgmgr-arch" / "pkgmgr-arch-virgin" / "pkgmgr-arch-slim".
 EOF
 }
 
@@ -57,7 +57,7 @@ while [[ $# -gt 0 ]]; do
     --missing)  MISSING_ONLY=1; shift ;;
     --target)
       TARGET="${2:-}"
-      [[ -n "${TARGET}" ]] || { echo "ERROR: --target requires a value (e.g. virgin)"; exit 2; }
+      [[ -n "${TARGET}" ]] || { echo "ERROR: --target requires a value (e.g. virgin|slim)"; exit 2; }
       shift 2
       ;;
     --tag)

scripts/build/publish.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# Publish all distro images (full + virgin) to a registry via image.sh --publish
+# Publish all distro images (full + virgin + slim) to a registry via image.sh --publish
 #
 # Required env:
 #   OWNER      (e.g. GITHUB_REPOSITORY_OWNER)
@@ -11,6 +11,9 @@ set -euo pipefail
 #   REGISTRY   (default: ghcr.io)
 #   IS_STABLE  (default: false)
 #   DISTROS    (default: "arch debian ubuntu fedora centos")
+#
+# Notes:
+# - This expects Dockerfile targets: virgin, full (default), slim
 
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 
@@ -33,7 +36,10 @@ for d in ${DISTROS}; do
   echo "[publish] PKGMGR_DISTRO=${d}"
   echo "============================================================"
 
+  # ----------------------------------------------------------
   # virgin
+  # -> ghcr.io/<owner>/pkgmgr-<distro>-virgin:{latest,<version>,stable?}
+  # ----------------------------------------------------------
   PKGMGR_DISTRO="${d}" bash "${SCRIPT_DIR}/image.sh" \
     --publish \
     --registry "${REGISTRY}" \
@@ -42,13 +48,29 @@ for d in ${DISTROS}; do
     --stable "${IS_STABLE}" \
     --target virgin
 
+  # ----------------------------------------------------------
   # full (default target)
+  # -> ghcr.io/<owner>/pkgmgr-<distro>:{latest,<version>,stable?}
+  # ----------------------------------------------------------
   PKGMGR_DISTRO="${d}" bash "${SCRIPT_DIR}/image.sh" \
     --publish \
     --registry "${REGISTRY}" \
     --owner "${OWNER}" \
     --version "${VERSION}" \
     --stable "${IS_STABLE}"
+
+  # ----------------------------------------------------------
+  # slim
+  # -> ghcr.io/<owner>/pkgmgr-<distro>-slim:{latest,<version>,stable?}
+  # + alias for default distro: ghcr.io/<owner>/pkgmgr-slim:{...}
+  # ----------------------------------------------------------
+  PKGMGR_DISTRO="${d}" bash "${SCRIPT_DIR}/image.sh" \
+    --publish \
+    --registry "${REGISTRY}" \
+    --owner "${OWNER}" \
+    --version "${VERSION}" \
+    --stable "${IS_STABLE}" \
+    --target slim
 done
 
 echo