Add scripts for pushing images and creating a release (#12)

* Create easy release scripts for staging and production

* Update staging URLs

* Log into image registry

* Change production target Helm repository

* Remove individual build/publish workflows in favor of the new combined one

* Pin versions of Railpack container images and copy them to local repository on release

* Move Geddes special case into source code instead of patching and building a separate image

---------

Co-authored-by: Emma Zheng <zheng861@purdue.edu>

Fix syntax error and give GITHUB_TOKEN write access

Create new buildx builder to allow remote registry caching

Fix typo

Author: FluxCapacitor2

.github/workflows/build-publish-anvilops.yml

@@ -0,0 +1,49 @@
+on:
+  workflow_dispatch:
+    inputs:
+      environment:
+        description: "Environment"
+        required: true
+        default: "staging"
+        type: choice
+        options:
+          - staging
+          - production
+      version:
+        description: "Version number (production only)"
+        required: false
+        type: string
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    if: ${{ inputs.environment }}
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v6
+
+      - name: Log in to image registry (Production)
+        if: ${{ inputs.environment == 'production' }}
+        run: docker login -u '${{ secrets.DOCKER_USERNAME }}' -p '${{ secrets.DOCKER_PASSWORD }}' registry.anvil.rcac.purdue.edu
+
+      - name: Log in to image registry (Staging)
+        if: ${{ inputs.environment == 'staging' }}
+        run: docker login -u '${{ secrets.DOCKER_USERNAME_STAGING }}' -p '${{ secrets.DOCKER_PASSWORD_STAGING }}' registry.anvil.rcac.purdue.edu
+
+        # This step is necessary because our script uses the destination OCI registry as a layer cache, which isn't supported by Docker out of the box.
+        # See https://docs.docker.com/build/cache/backends/registry/ and https://docs.docker.com/build/builders/drivers/ for more info.
+      - name: Set up buildx builder
+        run: |
+          docker buildx create --use
+          docker buildx inspect --bootstrap
+
+      - name: Release
+        run: ./.github/workflows/scripts/release-${{ inputs.environment }}.sh "${{ inputs.version }}"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Log out of container registry
+        if: always()
+        run: docker logout registry.anvil.rcac.purdue.edu