chore(workflow): implement oci releases (#248)

.github/workflows/nightly.yml

@@ -3,6 +3,10 @@ on:
   workflow_dispatch:
   schedule:
   - cron: "0 10 * * *"
+permissions:
+  contents: read
+  packages: write
+  id-token: write
 jobs:
   server:
     runs-on: ubuntu-latest
@@ -100,3 +104,40 @@ jobs:
         name: kratactl-${{ matrix.platform.os }}-${{ matrix.platform.arch }}
         path: "target/*/release/kratactl.exe"
       if: ${{ matrix.platform.os == 'windows' }}
+  oci:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        component:
+        - kratactl
+        - kratad
+        - kratanet
+        - krata-guest-init
+    name: "oci build ${{ matrix.component }}"
+    steps:
+    - uses: step-security/harden-runner@17d0e2bd7d51742c71671bd19fa12bdc9d40a3d6 # v2.8.1
+      with:
+        egress-policy: audit
+    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+      with:
+        submodules: recursive
+    - uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 # v3.5.0
+    - uses: docker/setup-buildx-action@4fd812986e6c8c2a69e18311145f9371337f27d4 # v3.4.0
+    - uses: docker/login-action@0d4c9c5ea7693da7b068278f7b52bda2a190a446 # v3.2.0
+      with:
+        registry: ghcr.io
+        username: "${{ github.actor }}"
+        password: "${{ secrets.GITHUB_TOKEN }}"
+    - uses: docker/build-push-action@1a162644f9a7e87d8f4b053101d1d9a712edc18c # v6.3.0
+      id: push
+      with:
+        file: ./images/Dockerfile.${{ matrix.component }}
+        platforms: linux/amd64,linux/aarch64
+        tags: "ghcr.io/edera-dev/${{ matrix.component }}:nightly"
+        push: true
+    - env:
+        DIGEST: "${{ steps.push.outputs.digest }}"
+        TAGS: "ghcr.io/edera-dev/${{ matrix.component }}:nightly"
+        COSIGN_EXPERIMENTAL: "true"
+      run: cosign sign --yes "${TAGS}@${DIGEST}"