Fix CI after switching to pnpm (#32449)

* Simplify CI for shared-components

Now that we use pnpm which understands monorepos we can skip manually installing shared-components in CI

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix docs workflow not being able to find pnpm version

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix storybook workflow not seeing lockfile and using wrong package manager

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix dockerbuild

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

.github/workflows/docs.yml

@@ -34,6 +34,8 @@ jobs:
                   path: matrix-js-sdk
 
             - uses: pnpm/action-setup@41ff72655975bd51cab0327fa583b6e92b6d3061 # v4
+              with:
+                  package_json_file: element-web/package.json
             - uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6
               with:
                   cache: "pnpm"