Update to 6.30.0, move from yarn to pnpm (#467)

ref TryGhost/Ghost@f186b6a

Ghost moved over **after 6.28 was cut** from yarn to pnpm for the package manager. As `yarn.lock` no longer exists, we need to update the Docker image to point ot the `pnpm-lock` file and run `corepack enable`.

---------

Co-authored-by: Tianon Gravi <admwiggin@gmail.com>

Author: 9larsons

6/alpine3.23/Dockerfile

@@ -64,6 +64,7 @@ ENV NODE_ENV production
 
 ENV GHOST_CLI_VERSION {{ .cli.version }}
 RUN set -eux; \
+	corepack enable; \
 	npm install -g "ghost-cli@$GHOST_CLI_VERSION"; \
 	npm cache clean --force
 
@@ -110,10 +111,9 @@ RUN set -eux; \
 	{{ clean_apt }}; \
 {{ ) end -}}
 	\
-	gosu node yarn cache clean; \
+	gosu node pnpm store prune; \
 	gosu node npm cache clean --force; \
 	npm cache clean --force; \
-	rm -rv /tmp/yarn* /tmp/v8*; \
 	\
 	# test that the optional dependencies are installed and loadable
 	cd current; \

6/bookworm/Dockerfile

@@ -1,6 +1,6 @@
 {
   "6": {
-    "version": "6.28.0",
+    "version": "6.30.0",
     "cli": {
       "version": "1.29.1"
     },

Dockerfile.template

@@ -49,16 +49,17 @@ for version in "${versions[@]}"; do
 
 	# get a list of architectures supported by the sharp module's prebuilt libraries
 	# we cannot build it on other arches since the dep, libvips, is usually too old in Debian and Alpine
-	doc="$(curl -fsSL "https://raw.githubusercontent.com/TryGhost/Ghost/refs/tags/v$fullVersion/yarn.lock" \
+	doc="$(curl -fsSL "https://raw.githubusercontent.com/TryGhost/Ghost/refs/tags/v$fullVersion/pnpm-lock.yaml" \
 		| jq --compact-output --raw-input --null-input '
 			reduce (
 				inputs
-				| capture("^ *\"@img/sharp-(?<dist>linux[a-z]*)-(?<arch>[a-z0-9]+)\" \"[0-9.]+\"$")
+				| capture("^ *'"'"'@img/sharp-(?<dist>linux[a-z]*)-(?<arch>[a-z0-9]+)@[0-9.]+'"'"':")
 			) as $item ({
 				# this controls the variant ordering
 				linux: [], # non-Alpine first
 				linuxmusl: [], # Alpine second
 			}; .[$item.dist] += [ $item.arch ])
+			| map_values(unique)
 			| with_entries(
 				select(.value | length > 0)
 				| .key = {