feature: add github workflow to rebuild images nightly

Author: kaniini

.github/workflows/nightly.yml

@@ -0,0 +1,45 @@
+name: nightly
+on:
+  workflow_dispatch:
+  schedule:
+  - cron: "0 10 * * *"
+permissions:
+  contents: read
+  packages: write
+  id-token: write
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        component:
+        - squashfs-tools
+    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@d70bba72b1f3fd22344832f00baa16ece964efeb # v3.3.0
+    - uses: docker/login-action@0d4c9c5ea7693da7b068278f7b52bda2a190a446 # v3.2.0
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - uses: docker/build-push-action@15560696de535e4014efeff63c48f16952e52dd1 # v6.2.0
+      id: push-step
+      with:
+        file: ./Dockerfile.${{ matrix.component }}
+        platforms: linux/amd64,linux/aarch64
+        tags: ghcr.io/edera-dev/${{ matrix.component }}:nightly
+        push: true
+    - name: Sign the image
+      env:
+        DIGEST: ${{ steps.push-step.outputs.digest }}
+        TAGS: ghcr.io/edera-dev/${{ matrix.component }}:nightly
+        COSIGN_EXPERIMENTAL: "true"
+      run: cosign sign --yes "${TAGS}@${DIGEST}"