Update docker workflow for forgejo

.github/workflows/docker.yml

@@ -1,20 +1,11 @@
-# GitHub actions workflow which builds and publishes the docker images.
-
 name: Build docker images
 
 on:
   push:
-    tags: ["v*"]
     branches: [ main ]
-  workflow_dispatch:
 
-permissions:
-  contents: read
-  packages: write
-  id-token: write # needed for signing the images with GitHub OIDC Token
 jobs:
   build:
-    if: github.repository == 'ethanaobrien/ew'
     runs-on: ubuntu-latest
     steps:
       - name: Set up QEMU
@@ -27,18 +18,7 @@ jobs:
         id: buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Inspect builder
-        run: docker buildx inspect
-
-      - name: Install Cosign
-        uses: sigstore/cosign-installer@v3.5.0
-
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
       - name: Extract version from Cargo.toml
-        # Note: explicitly requesting bash will mean bash is invoked with `-eo pipefail`, see
-        # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsshell
         shell: bash
         run: |
           echo "EW_VERSION=$(grep "^version" Cargo.toml | sed -E 's/version\s*=\s*["]([^"]*)["]/\1/')" >> $GITHUB_ENV