Pass tags with INPUT_TAGS in docker bake job (#33574)

* Pass tags with INPUT_TAGS in docker bake job

Truly hideous mess of shell to set both env vars in the prebuild step.

As the env var doesn't seem to be available to the actual executor
but clearly must be available to the docker that it runs.

* gnore printf, it's a shell builtin

knip.ts

@@ -12,7 +12,7 @@ export default {
                 // Used in playwright-screenshots.sh
                 "wait-on",
             ],
-            ignoreBinaries: ["awk"],
+            ignoreBinaries: ["awk", "printf"],
         },
         "packages/module-api": {},
         "apps/web": {

packages/playwright-common/project.json

@@ -18,7 +18,7 @@
         },
         "docker:prebuild": {
             "cache": true,
-            "command": "echo PLAYWRIGHT_VERSION=$(pnpm --silent -- playwright --version | awk '{print $2}') > .env.docker:build",
+            "command": "PLAYWRIGHT_VERSION=$(pnpm --silent -- playwright --version | awk '{print $2}') && printf '%s\\n' \"PLAYWRIGHT_VERSION=$PLAYWRIGHT_VERSION\" \"INPUT_TAGS=\\\"type=ref,event=branch\\ntype=raw,enable={{is_default_branch}},value=$PLAYWRIGHT_VERSION\\\"\" > .env.docker:build",
             "inputs": [{ "runtime": "pnpm --silent -- playwright --version" }],
             "outputs": ["{projectRoot}/.env.docker:build"],
             "options": { "cwd": "packages/playwright-common" }
@@ -35,8 +35,7 @@
                 "build-args": ["PLAYWRIGHT_VERSION"],
                 "context": "{projectRoot}",
                 "metadata": {
-                    "images": ["ghcr.io/element-hq/element-web/playwright-server"],
-                    "tags": ["type=ref,event=branch", "type=raw,enable={{is_default_branch}},value=$PLAYWRIGHT_VERSION"]
+                    "images": ["ghcr.io/element-hq/element-web/playwright-server"]
                 }
             }
         }