[Chore] Add custom CI Docker image with Node.js 24, pnpm 10, and uv (#268)

This is meant to drastically speed up CI because it skips the lengthy installation.

Co-authored-by: jebus <lorsbach@envipath.com>
Reviewed-on: enviPath/enviPy#268
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

.gitea/actions/setup-envipy/action.yaml

@@ -21,12 +21,6 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - name: Install system tools via apt
-      shell: bash
-      run: |
-        sudo apt-get update
-        sudo apt-get install -y postgresql-client openjdk-11-jre-headless
-
     - name: Setup ssh
       shell: bash
       run: |
@@ -37,22 +31,6 @@ runs:
         eval $(ssh-agent -s)
         ssh-add ~/.ssh/id_ed25519
 
-    - name: Install pnpm
-      uses: pnpm/action-setup@v4
-      with:
-        version: 10
-
-    - name: Use Node.js
-      uses: actions/setup-node@v4
-      with:
-        node-version: 20
-        cache: "pnpm"
-
-    - name: Install uv
-      uses: astral-sh/setup-uv@v6
-      with:
-        enable-cache: true
-
     - name: Setup Python venv
       shell: bash
       run: |