Set up devcontainer & gitpod

.devcontainer/.devcontainer.json

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+{
+    "name": "pulumi-codespace",
+    "build": {
+      "dockerfile": "../.gitpod.Dockerfile",
+    },
+    "postCreateCommand": "make install",
+    "remoteUser": "gitpod",
+    "containerEnv": {
+        "PULUMI_ACCESS_TOKEN": "${localEnv:PULUMI_ACCESS_TOKEN}",
+        "PULUMI_TEST_ORG": "${localEnv:PULUMI_TEST_ORG}"
+    },
+    "extensions": ["golang.go", "ms-dotnettools.csharp", "ms-python.python", "formulahendry.dotnet-test-explorer"],
+}

.gitpod.Dockerfile

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+FROM gitpod/workspace-full
+
+USER root
+
+# Install latest Pulumi CLI
+RUN curl -fsSL https://get.pulumi.com/ | bash; \
+    mv ~/.pulumi/bin/* /usr/bin
+
+# Install latest pulumictl
+RUN wget -O pulumictl.tar.gz $(curl -s https://api.github.com/repos/pulumi/pulumictl/releases/latest | jq -rc '.assets | map(select(.name | contains("linux-amd64"))) | .[] .browser_download_url') \
+    && tar xzf pulumictl.tar.gz -C /usr/bin pulumictl \
+    && rm -f pulumictl.tar.gz \
+    && pulumictl version
+
+USER gitpod
+
+# Install .NET SDK (Current channel)
+# Source: https://docs.microsoft.com/dotnet/core/install/linux-scripted-manual#scripted-install
+RUN mkdir -p /home/gitpod/dotnet && curl -fsSL https://dot.net/v1/dotnet-install.sh | bash /dev/stdin --channel Current --install-dir /home/gitpod/dotnet
+ENV DOTNET_ROOT=/home/gitpod/dotnet
+ENV PATH=$PATH:/home/gitpod/dotnet

.gitpod.yml

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+image:
+  file: .gitpod.Dockerfile
+
+tasks:
+  - init: make install
+
+vscode:
+  extensions:
+    - "golang.go"
+    - "ms-dotnettools.csharp"
+    - "ms-python.python"
+    - "formulahendry.dotnet-test-explorer"
+
+# See: https://www.gitpod.io/docs/prebuilds/#configure-the-github-app
+github:
+  prebuilds:
+    master: true
+    branches: true
+    pullRequests: true
+    pullRequestsFromForks: true
+    addCheck: true