docs: README updated to reflect new paths and versions.

Author: klardotsh

.github/workflows/build-and-push-ghcr-common.yml

@@ -4,7 +4,7 @@ on:
     inputs:
       # N.B.: This behavior is not concurrency-safe and updates the mutable
       # :latest image tag
-      push-latest:
+      allow-push-latest:
         type: boolean
       primary-registry-tag:
         type: string
@@ -28,8 +28,11 @@ jobs:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ github.token }}
+      - name: Calculate highest version number from Git tags
+        if: inputs.allow-push-latest
+        run: echo "MOST_RECENT_TAG=$(git tag | sort --version-sort | tail -n1)" >> $GITHUB_ENV
       - name: Set PUSH_LATEST_TAG in environment
-        if: inputs.push-latest
+        if: inputs.allow-push-latest && github.ref_name == env.MOST_RECENT_TAG
         run: echo "PUSH_LATEST_TAG=1" >> $GITHUB_ENV
       - name: Set REGISTRY_TAG in environment
         if: inputs.primary-registry-tag != ''

.github/workflows/build-and-push-ghcr-latest.yml

@@ -3,12 +3,12 @@ name: Publish Docker Image to GHCR (versioned + :latest)
 
 on:
   push:
-    branches:
-      - main
+    tags:
+      - '*'
 
 jobs:
   multiarch-image:
     uses: ./.github/workflows/build-and-push-ghcr-common.yml
     secrets: inherit
     with:
-      push-latest-tag: true
+      allow-push-latest-tag: true

IMAGE_TAG

@@ -4,17 +4,22 @@
 
 This is a container image for running [Zulip](https://zulip.com)
 ([GitHub](https://github.com/zulip/zulip)) in
-[production][prod-overview]. Image available from:
+[production][prod-overview].
 
-- [**Docker Hub**](https://hub.docker.com/r/zulip/docker-zulip) (`docker pull zulip/docker-zulip:6.1-0`)
 
-Current Zulip version: `6.1`
-Current Docker image version: `6.1-0`
-Current architectures supported: `amd64`
+```sh
+docker pull ghcr.io/zulip/zulip
 
-<!-- Remove when https://github.com/zulip/docker-zulip/issues/357 resolved -->
-> `arm64` support is experimental, and is not provided in the Docker Hub
-> images. To build an `arm64` image yourself, see `make help` locally.
+# Or, pin a version:
+docker pull ghcr.io/zulip/zulip:6.1-1
+```
+
+- Current Zulip Server version: `6.1`
+- Current Docker image version: `6.1-1`
+- Current architectures supported: `amd64`, `arm64`
+
+See all available image tags [in GitHub Container
+Registry](https://github.com/orgs/zulip/packages/container/package/zulip).
 
 Project status: **Alpha**. While these images work and are used by many sites
 in production, configuring is substantially more error-prone than the [bare

README.md

@@ -43,7 +43,13 @@
 set -ex
 
 REGISTRY="${REGISTRY:-ghcr.io/zulip/zulip}"
-REGISTRY_TAG="${REGISTRY_TAG:-$(tail -n 1 < "$(git rev-parse --show-toplevel)/IMAGE_TAG")}"
+REGISTRY_TAG="${REGISTRY_TAG:-${GITHUB_REF_NAME}}"
+
+if [ -z "${REGISTRY_TAG}" ]; then
+	echo "REGISTRY_TAG must be set in environment (default is \$GITHUB_REF_NAME, also from environment)" > /dev/stderr
+	exit 1
+fi
+
 PRIMARY_IMAGE="${REGISTRY}:${REGISTRY_TAG}"
 
 if [ "${SKIP_PULL_CHECK}" != "1" ]; then