Remove UPGRADE notes (v1 EOL)

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

UPGRADE.md

@@ -1,133 +0,0 @@
-# Upgrade notes
-
-## v1 to v2
-
-* Input `path` is now called `context` for consistency with other Docker build tools
-* `path` defaults to current git repository so checkout action is not required in a workflow
-* Rename `dockerfile` input to `file` for consistency with other Docker build tools
-* Rename `always_pull` input to `pull` for consistency with other Docker build tools
-* Add `builder` input to be able to choose a builder instance through our [setup-buildx action](https://github.com/docker/setup-buildx-action)
-* Add `platforms` input to support multi-platform builds
-* Add `allow` input
-* Add `load` input
-* Add `outputs` input
-* Add `cache-from` input (`cache_froms` removed)
-* Add `cache-to` input
-* Rename `build_args` input to `build-args` for consistency with other Docker build tools
-* Add `secrets` input
-* Review `tags` input
-* Remove `repository` input. See [Simple workflow](#simple-workflow) for migration
-* Remove `username`, `password` and `registry` inputs. Login support moved to [docker/login-action](https://github.com/docker/login-action) repo
-* Remove `tag_with_sha`, `tag_with_ref`, `add_git_labels` inputs. See [Tags with ref and Git labels](#tags-with-ref-and-git-labels) for migration
-* Handle Git context
-* Add `digest` output
-
-### Simple workflow
-
-```yaml
-# v1
-steps:
-  -
-    name: Checkout
-    uses: actions/checkout@v2
-  -
-    name: Build and push Docker images
-    uses: docker/build-push-action@v1
-    with:
-      username: ${{ secrets.DOCKER_USERNAME }}
-      password: ${{ secrets.DOCKER_PASSWORD }}
-      repository: myorg/myrepository
-      always_pull: true
-      build_args: arg1=value1,arg2=value2
-      cache_froms: myorg/myrepository:latest
-      tags: latest
-```
-
-```yaml
-# v2
-steps:
-  -
-    name: Checkout
-    uses: actions/checkout@v2
-  -
-    name: Set up Docker Buildx
-    uses: docker/setup-buildx-action@v1
-  -
-    name: Login to DockerHub
-    uses: docker/login-action@v1
-    with:
-      username: ${{ secrets.DOCKER_USERNAME }}
-      password: ${{ secrets.DOCKER_PASSWORD }}
-  -
-    name: Build and push
-    uses: docker/build-push-action@v2
-    with:
-      context: .
-      pull: true
-      push: true
-      build-args: |
-        arg1=value1
-        arg2=value2
-      cache-from: type=registry,ref=myorg/myrepository:latest
-      cache-to: type=inline
-      tags: myorg/myrepository:latest
-```
-
-### Tags with ref and Git labels
-
-```yaml
-# v1
-steps:
-  -
-    name: Checkout
-    uses: actions/checkout@v2
-  -
-    name: Build and push Docker images
-    uses: docker/build-push-action@v1
-    with:
-      username: ${{ secrets.DOCKER_USERNAME }}
-      password: ${{ secrets.DOCKER_PASSWORD }}
-      repository: myorg/myrepository
-      push: ${{ github.event_name != 'pull_request' }}
-      tag_with_ref: true
-      tag_with_sha: true
-      add_git_labels: true
-```
-
-```yaml
-# v2
-steps:
-  -
-    name: Checkout
-    uses: actions/checkout@v2
-  -
-    name: Docker meta
-    id: meta
-    uses: docker/metadata-action@v3
-    with:
-      images: |
-        myorg/myrepository
-      tags: |
-        type=ref,event=branch
-        type=ref,event=pr
-        type=semver,pattern={{version}}
-        type=sha
-  -
-    name: Set up Docker Buildx
-    uses: docker/setup-buildx-action@v1
-  -
-    name: Login to DockerHub
-    if: github.event_name != 'pull_request'
-    uses: docker/login-action@v1 
-    with:
-      username: ${{ secrets.DOCKER_USERNAME }}
-      password: ${{ secrets.DOCKER_PASSWORD }}
-  -
-    name: Build and push
-    uses: docker/build-push-action@v2
-    with:
-      context: .
-      push: ${{ github.event_name != 'pull_request' }}
-      tags: ${{ steps.meta.outputs.tags }}
-      labels: ${{ steps.meta.outputs.labels }}
-```