ci: tag and push to envbox-preview on merge to main (#80)

Signed-off-by: Cian Johnston <cian@coder.com>

Author: johnstcn

.github/workflows/ci.yaml

@@ -259,8 +259,9 @@ jobs:
       - name: build image
         run: make -j build/image/envbox
 
-      - name: tag image
-        run: docker tag envbox ghcr.io/coder/envbox:latest
-
-      - name: push image
-        run: docker push ghcr.io/coder/envbox:latest
+      - name: Tag and push envbox-preview
+        run: |
+          VERSION=$(./scripts/version.sh)-dev-$(git rev-parse --short HEAD)
+          BASE=ghcr.io/coder/envbox-preview
+          docker tag envbox "${BASE}:${VERSION}"
+          docker push "${BASE}:${VERSION}"

scripts/version.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+last_tag="$(git describe --tags --abbrev=0)"
+version="$last_tag"
+
+# Remove the "v" prefix.
+echo "${version#v}"