Add Github workflow for building and testing

PiperOrigin-RevId: 848330258

Author: schoppmp

shell_encryption/.github/workflows/presubmit.yml

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+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: SHELL-Encryption
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on:
+      labels: ubuntu-24.04-64core
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # pin@v3
+
+      - name: Cache bazel build artifacts
+        uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # [email protected]
+        with:
+          path: |
+            ~/.cache/bazel
+          key: ${{ runner.os }}-${{ hashFiles('.bazelrc', 'MODULE.bazel.lock') }}-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-${{ hashFiles('.bazelrc', 'MODULE.bazel.lock') }}-
+
+      - name: "Run `bazel build`"
+        run: |
+          bazel build -c opt //...
+
+      - name: "Run `bazel test`"
+        run: |
+          bazel test -c opt //...