Reduce Lists Memory usage, update CI (#17706)

* Convert alerts to a lazylist

* Convert fullscreens to lazylist

* Convert ckeys_allowed_itemspawn to a lazylist

* Convert camera lists to lazylists

* Get rid of an old unused footstep_sounds list

* Make flooring_cache a lazy list

* Fix flooring_blacklist, convert a bunch more flooring lists to lazylists

* Improve ci byond caching

.github/actions/restore_or_install_byond/action.yml

@@ -0,0 +1,51 @@
+# This action attempts to restore BYOND from a cache, or to install it otherwise.
+name: Restore or Install BYOND
+description: Attempts to restore a specified BYOND version from cache; if it can't, it installs it.
+
+inputs:
+  major:
+    description: "The major BYOND version to install. Defaults to the BYOND_MAJOR specified in `dependencies.sh`."
+    required: false
+    type: string
+  minor:
+    description: "The minor BYOND version to install. Defaults to the BYOND_MINOR specified in `dependencies.sh`."
+    required: false
+    type: string
+
+runs:
+  using: composite
+  steps:
+    - name: Configure BYOND version from inputs
+      if: ${{ inputs.major }}
+      shell: bash
+      run: |
+        echo "BYOND_MAJOR=${{ inputs.major }}" >> $GITHUB_ENV
+        echo "BYOND_MINOR=${{ inputs.minor }}" >> $GITHUB_ENV
+    - name: Configure BYOND version from dependencies.sh
+      if: ${{ !inputs.major }}
+      shell: bash
+      run: |
+        source dependencies.sh
+        echo "BYOND_MAJOR=$BYOND_MAJOR" >> $GITHUB_ENV
+        echo "BYOND_MINOR=$BYOND_MINOR" >> $GITHUB_ENV
+
+    # The use of `actions/cache/restore` and `actions/cache/save` here is deliberate, as we want to
+    # save the BYOND install to a cache as early as possible. If we used just `actions/cache`, it
+    # would only attempt to save the cache at the end of a job. This ensures that if a workflow run
+    # is cancelled, we already have a cache to restore from.
+    - name: Restore BYOND cache
+      id: restore_byond_cache
+      uses: actions/cache/restore@v4
+      with:
+        path: ~/BYOND
+        key: ${{ runner.os }}-byond-${{ env.BYOND_MAJOR }}-${{ env.BYOND_MINOR }}
+    - name: Install BYOND
+      if: ${{ !steps.restore_byond_cache.outputs.cache-hit }}
+      shell: bash
+      run: bash tools/ci/install_byond.sh
+    - name: Save BYOND cache
+      if: ${{ !steps.restore_byond_cache.outputs.cache-hit }}
+      uses: actions/cache/save@v4
+      with:
+        path: ~/BYOND
+        key: ${{ steps.restore_byond_cache.outputs.cache-primary-key }}

.github/actions/setup_node/action.yml

@@ -0,0 +1,26 @@
+# This action is a wrapper around `actions/setup-node`, to use the version specified in
+# `dependencies.sh`.
+name: Setup Node
+description: Install Node using the version specified in `dependencies.sh`; additionally, restores the Yarn cache if one exists
+
+inputs:
+  restore-yarn-cache:
+    description: 'If `true`, restores the Yarn cache alongside installing node.'
+    required: false
+    type: boolean
+    default: false
+
+runs:
+  using: composite
+  steps:
+    - name: Configure Node version
+      shell: bash
+      run: |
+        source dependencies.sh
+        echo "NODE_VERSION_REQUIRED=$NODE_VERSION_LTS" >> $GITHUB_ENV
+    - name: Install Node
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ env.NODE_VERSION_REQUIRED }}
+        cache: ${{ fromJSON(inputs.restore-yarn-cache) && 'yarn' || '' }}
+        cache-dependency-path: ${{ fromJSON(inputs.restore-yarn-cache) && 'tgui/yarn.lock' || '' }}