diff --git a/.github/install_gamer_env.sh b/.github/install_gamer_env.sh
new file mode 100755
index 0000000000..316433bf21
--- /dev/null
+++ b/.github/install_gamer_env.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Install GAMER Environment for GitHub-hosted GitHub Actions runners
+# This script installs dependencies needed to compile and run GAMER
+
+set -e
+
+echo "Installing GAMER dependencies..."
+
+# Install OpenMPI, HDF5, and CUDA toolkit
+sudo apt-get install -y openmpi-bin libopenmpi-dev libhdf5-dev nvidia-cuda-toolkit
+
+echo ""
+echo "Verifying installations..."
+echo "MPI:"
+which mpirun
+which mpicxx
+mpicxx --version
+
+echo ""
+echo "CUDA:"
+which nvcc
+nvcc --version
+
+echo ""
+echo "HDF5:"
+h5cc -show
+
+echo ""
+echo "Configuring GAMER machine settings..."
+cd "$(git rev-parse --show-toplevel)/tool/config"
+bash set_settings.sh --local --machine=github_action
+
+echo ""
+echo "Verifying configuration..."
+cat "$(git rev-parse --show-toplevel)/src/.local_settings"
+
+echo ""
+echo "GAMER environment setup complete!"
diff --git a/.github/workflows/copilot-setup-steps.yml b/.github/workflows/copilot-setup-steps.yml
new file mode 100644
index 0000000000..4d1d652e33
--- /dev/null
+++ b/.github/workflows/copilot-setup-steps.yml
@@ -0,0 +1,33 @@
+name: "Copilot Setup Steps"
+
+# Automatically run the setup steps when they are changed to allow for easy validation, and
+# allow manual testing through the repository's "Actions" tab
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+      - .github/install_gamer_env.sh
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+      - .github/install_gamer_env.sh
+
+jobs:
+  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+
+    # Set the permissions to the lowest permissions possible needed for your steps.
+    # Copilot will be given its own token for its operations.
+    permissions:
+      contents: read
+
+    # You can define any steps you want, and they will run before the agent starts.
+    # If you do not check out your code, Copilot will do this for you.
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Setup GAMER Environment
+        run: bash .github/install_gamer_env.sh
diff --git a/configs/github_action.config b/configs/github_action.config
new file mode 100644
index 0000000000..5f90b38317
--- /dev/null
+++ b/configs/github_action.config
@@ -0,0 +1,33 @@
+# GitHub-hosted GitHub Actions runners (Ubuntu)
+# https://docs.github.com/en/actions/reference/runners/github-hosted-runners
+
+# 1. Paths
+CUDA_PATH       /usr
+FFTW2_PATH      /path/to/fftw2
+FFTW3_PATH      /path/to/fftw3
+MPI_PATH        /usr
+HDF5_PATH       /usr/lib/x86_64-linux-gnu/hdf5/serial
+GRACKLE_PATH    /path/to/grackle
+GSL_PATH        /path/to/gsl
+LIBYT_PATH      /path/to/libyt
+CUFFTDX_PATH    /path/to/cufftdx
+
+# 2. Compiler type
+CXX     g++                     # Serial compiler
+CXX_MPI mpicxx                  # MPI compiler (The MPI_PATH/bin/ will be combined automatically)
+
+# 3. Compiler flags
+CXXFLAG -g
+CXXFLAG -O2
+
+OPENMPFLAG -fopenmp
+
+#LIBFLAG
+
+NVCCFLAG_COM -O3 -I/usr/include/x86_64-linux-gnu/mpi
+#NVCCFLAG_COM -use_fast_math
+NVCCFLAG_FLU -Xptxas -dlcm=ca -prec-div=false -ftz=true
+NVCCFLAG_POT -Xptxas -dlcm=ca
+
+# 4. Set the GPU Compute Capability
+GPU_COMPUTE_CAPABILITY 750    # NVIDIA Tesla T4