Import protocol crate from session-sharing-server repo. (#1)

This yanks the `session-sharing-protocol` crate from
`https://github.com/warpdotdev/session-sharing-server` into this
dedicated repository.

The client compiles against this protocol, so when we open-source the
client, we'll need to make the protocol code public too. We don't want
to make the server code public, though, so they need to be in separate
repos (hence this PR).

Once this merges, I'll send out a pair of follow-up PRs to update the
client repo to point at the crate here, and the server repo to remove
the crate from there and instead point at it here.

Author: vorporeal

.github/dependabot.yml

@@ -0,0 +1,40 @@
+# Please see the documentation for all configuration options:
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    reviewers:
+      - "warpdotdev/tech-leads"
+    # Only send security updates, not general version updates.
+    open-pull-requests-limit: 0
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    reviewers:
+      - "warpdotdev/tech-leads"
+    cooldown:
+      # Don't update to any action release that is less than two weeks old.
+      default-days: 14
+    groups:
+      # Group all non-major updates of official actions together - they're lower-risk.
+      official-actions:
+        applies-to: version-updates
+        patterns:
+          - "actions/*"
+        update-types:
+          - "minor"
+          - "patch"
+      # Group all non-major updates of Namespace actions together - they're lower-risk.
+      namespace-actions:
+        applies-to: version-updates
+        patterns:
+          - "namespacelabs/*"
+          - "namespace-actions/*"
+        update-types:
+          - "minor"
+          - "patch"

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  ci:
+    name: CI
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+    - name: Setup SSH keys for private crates
+      uses: webfactory/ssh-agent@e83874834305fe9a4a2997156cb26c5de65a8555 # v0.10.0
+      with:
+        ssh-private-key: ${{ secrets.WARP_MACHINE_USER_SSH_PRIVATE_KEY }}
+
+    - name: Run cargo fmt
+      run: cargo fmt --check
+
+    - name: Run cargo clippy
+      run: cargo clippy --all-targets --all-features -- -D warnings
+
+    - name: Install cargo nextest
+      uses: taiki-e/install-action@055f5df8c3f65ea01cd41e9dc855becd88953486 # v2.75.18
+      with:
+        tool: nextest
+
+    - name: Run tests
+      run: cargo nextest run --workspace --no-tests=warn

.gitignore

@@ -0,0 +1,7 @@
+/target
+
+# IDE things
+.idea/*
+
+# DS_STORE
+.DS_STORE