Make workflow runs dispatchable manually

.github/workflows/docker-manual.yml

@@ -0,0 +1,34 @@
+name: Push to GHCR (Manual)
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        required: true
+        description: "Build specific tag"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.inputs.tag }}
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build & push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository }}:latest
+            ghcr.io/${{ github.repository }}:${{ github.event.inputs.tag }}

.github/workflows/goreleaser.yml

@@ -4,6 +4,7 @@ on:
   push:
     tags:
       - '*'
+  workflow_dispatch:
 
 jobs:
   goreleaser:

.github/workflows/tests.yml

@@ -2,6 +2,7 @@ name: Run tests
 
 on:
   pull_request:
+  workflow_dispatch:
 
 jobs:
   lint: