feat: add custom Gitpod Dockerfile with PHP 8 and Deno support

.gitpod.Dockerfile

@@ -0,0 +1,6 @@
+FROM gitpod/workspace-full
+
+RUN curl -fsSL https://deno.land/x/install/install.sh | sh
+RUN /home/gitpod/.deno/bin/deno completions bash > /home/gitpod/.bashrc.d/90-deno &&     echo 'export DENO_INSTALL="/home/gitpod/.deno"' >> /home/gitpod/.bashrc.d/90-deno &&     echo 'export PATH="$DENO_INSTALL/bin:$PATH"' >> /home/gitpod/.bashrc.d/90-deno
+
+RUN sudo apt-get install php8.0

.gitpod.yml

@@ -1,3 +1,6 @@
+image:
+  file: .gitpod.Dockerfile
+
 tasks:
   - init: docker-compose pull &&
       docker-compose build &&