chore: support --cache-from arg

README.md

@@ -35,6 +35,7 @@ Builds and tags a docker image.
 |INPUT_TARGET|no|Target build stage to build|
 |INPUT_BUILD_ARGS|no|Comma-delimited list of build-args|
 |INPUT_LABELS|no|Comma-delimited list of labels|
+|INPUT_CACHE_FROMS|no|Comma-delimited list of cache-froms|
 
 See the tagging section for information on tag inputs
 

internal/command/args.go

@@ -37,6 +37,10 @@ func BuildArgs(o options.Build, github options.GitHub, tags []string) []string {
 		args = append(args, "--pull")
 	}
 
+	for _, cacheFrom := range o.CacheFroms {
+		args = append(args, "--cache-from", cacheFrom)
+	}
+
 	for _, buildArg := range o.BuildArgs {
 		args = append(args, "--build-arg", buildArg)
 	}

internal/command/args_test.go

@@ -77,6 +77,14 @@ func TestBuildArgs(t *testing.T) {
 			},
 			expected: []string{"build", "--progress", "plain", "--build-arg", "build-arg-1", "--build-arg", "build-arg-2", "."},
 		},
+		{
+			name: "with-cache-from",
+			build: options.Build{
+				Path:       ".",
+				CacheFroms: []string{"foo/bar-1", "foo/bar-2"},
+			},
+			expected: []string{"build", "--progress", "plain", "--cache-from", "foo/bar-1", "--cache-from", "foo/bar-2", "."},
+		},
 	}
 	for _, tc := range testCases {
 		tc := tc

internal/options/build.go

@@ -17,6 +17,7 @@ type Build struct {
 	AddGitLabels bool   `env:"INPUT_ADD_GIT_LABELS"`
 	Target       string `env:"INPUT_TARGET"`
 	AlwaysPull   bool   `env:"INPUT_ALWAYS_PULL"`
+	CacheFroms   []string
 	BuildArgs    []string
 	Labels       []string
 }
@@ -28,6 +29,10 @@ func GetBuildOptions() (Build, error) {
 		return build, err
 	}
 
+	if cacheFroms := os.Getenv("INPUT_CACHE_FROMS"); cacheFroms != "" {
+		build.CacheFroms = strings.Split(cacheFroms, ",")
+	}
+
 	if buildArgs := os.Getenv("INPUT_BUILD_ARGS"); buildArgs != "" {
 		build.BuildArgs = strings.Split(buildArgs, ",")
 	}

internal/options/build_test.go

@@ -12,6 +12,7 @@ import (
 func TestGetBuildOptions(t *testing.T) {
 	_ = os.Setenv("INPUT_PATH", "path")
 	_ = os.Setenv("INPUT_DOCKERFILE", "dockerfile")
+	_ = os.Setenv("INPUT_CACHE_FROMS", "foo/bar-1,foo/bar-2")
 	_ = os.Setenv("INPUT_REPOSITORY", "repository")
 	_ = os.Setenv("INPUT_BUILD_ARGS", "buildarg1=b1,buildarg2=b2")
 	_ = os.Setenv("INPUT_LABELS", "label1=l1,label2=l2")
@@ -29,6 +30,7 @@ func TestGetBuildOptions(t *testing.T) {
 		AlwaysPull: true,
 		BuildArgs:  []string{"buildarg1=b1", "buildarg2=b2"},
 		Labels:     []string{"label1=l1", "label2=l2"},
+		CacheFroms: []string{"foo/bar-1", "foo/bar-2"},
 	}, o)
 }